List of computing and IT abbreviations

This is a list of computing and IT acronyms, initialisms and abbreviations.

0–9

• 0-day—Zero-day vulnerability
• 1GL—First-generation programming language
• 1NF—First normal form
• 10B2—10BASE-2
• 10B5—10BASE-5
• 10B-F—10BASE-F
• 10B-FB—10BASE-FB
• 10B-FL—10BASE-FL
• 10B-FP—10BASE-FP
• 10B-T—10BASE-T
• 100B-FX—100BASE-FX
• 100B-TX—100BASE-TX
• 100BVG—100BASE-VG
• 286—Intel 80286 processor
• 2B1Q—2 binary 1 quaternary
• 2FA—Two-factor authentication
• 2GL—Second-generation programming language
• 2NF—Second normal form
• 3DES—Triple Data Encryption Standard
• 3GL—Third-generation programming language
• 3GPP—3rd Generation Partnership Project – 3G comms
• 3GPP2—3rd Generation Partnership Project 2
• 3NF—Third normal form
• 386—Intel 80386 processor
• 486—Intel 80486 processor
• 4B5BLF—4-bit 5-bit local fiber
• 4GL—Fourth-generation programming language
• 4NF—Fourth normal form
• 5GL—Fifth-generation programming language
• 5NF—Fifth normal form
• 6NF—Sixth normal form
• 8B10BLF—8-bit 10-bit local fiber
• 802.11—wireless LAN
• 8D—Eight disciplines problem solving

A

• A11Y—Accessibility
• AAA—Authentication, authorization, and accounting
• AABB—Axis-aligned bounding box
• AAC—Advanced Audio Coding
• AAL—ATM Adaptation Layer
• AALC—ATM Adaptation Layer Connection
• AARP—AppleTalk Address Resolution Protocol
• ABAC—Attribute-Based Access Control
• ABCL—Actor-Based Concurrent Language
• ABI—Application Binary Interface
• ABM—Asynchronous Balanced Mode
• ABR—Area Border Router
• ABR—Auto Baud-Rate detection
• ABR—Available Bitrate
• ABR—Average Bitrate
• ABR—Adaptive Bitrate (Streaming)
• AC—Acoustic Coupler
• AC—Alternating Current
• AC—Authorization certificate
• ACD—Automatic Call Distributor
• ACE—Advanced Computing Environment
• ACID—Atomicity Consistency Isolation Durability
• ACK—Acknowledgement
• ACK—Amsterdam Compiler Kit
• ACL—Access Control List
• ACL—Active Current Loop
• ACM—Association for Computing Machinery
• ACME—Automated Classification of Medical Entities
• ACP—Airline Control Program
• ACPI—Advanced Configuration and Power Interface
• ACR—Allowed Cell Rate
• ACR—Attenuation to Crosstalk Ratio
• AD—Active Directory
• AD—Administrative Domain
• ADC—Analog-to-Digital Converter
• ADC—Apple Display Connector
• ADB—Apple Desktop Bus
• ADCCP—Advanced Data Communications Control Procedures
• ACE—Advanced Computing Environment
• ADDS—Applied Digital Data Systems
• ADO—ActiveX Data Objects
• ADSL—Asymmetric Digital Subscriber Line
• ADT—Abstract Data Type
• AE—Adaptive Equalizer
• AE—Authenticated encryption
• AEAD—Authenticated encryption with associated data
• AES—Advanced Encryption Standard
• AF—Anisotropic Filtering
• AFIPS—American Federation of Information Processing Societies
• AFP—Apple Filing Protocol
• AGI—Artificial General Intelligence
• AGP—Accelerated Graphics Port
• AH—Active Hub
• AH—Authentication Header
• AHCI—Advanced Host Controller Interface
• AI—Artificial Intelligence
• AIS—Automated Indicator Sharing
• AIX—Advanced Interactive eXecutive
• Ajax—Asynchronous JavaScript and XML
• AL—Active Link
• AL—Access List
• ALAC—Apple Lossless Audio Codec
• ALE—Annualized loss expectancy
• ALGOL—Algorithmic Language
• ALSA—Advanced Linux Sound Architecture
• ALU—Arithmetic and Logical Unit
• AM—Access Method
• AM—Active Matrix
• AMOLED—Active-Matrix Organic Light-Emitting Diode
• AMQP—Advanced Message Queuing Protocol
• AM—Active Monitor
• AM—Allied Mastercomputer
• AM—Amplitude Modulation
• AMD—Advanced Micro Devices
• AMI—Amazon Machine Image
• AMQP—Advanced Message Queuing Protocol
• AMR—Audio Modem Riser
• ANN—Artificial Neural Network
• ANSI—American National Standards Institute
• ANT—Another Neat Tool
• AoE—ATA over Ethernet
• AOP—Aspect-Oriented Programming
• AOT—Ahead-Of-Time
• AP—Access point
• APCI—Application-Layer Protocol Control Information
• APFS—Apple File System
• API—Application Programming Interface
• APIC—Advanced Programmable Interrupt Controller
• APIPA—Automatic Private IP Addressing
• APL—A Programming Language
• APR—Apache Portable Runtime
• APT—Advanced persistent threat
• ARC—Adaptive Replacement Cache
• ARC—Advanced RISC Computing
• ARIN—American Registry for Internet Numbers
• ARIS—Architecture of Integrated Information Systems
• ARM—Advanced RISC Machines
• ARO—Annualized rate of occurrence
• AROS—AROS Research Operating System
• ARP—Address Resolution Protocol
• ARPA—Address and Routing Parameter Area
• ARPA—Advanced Research Projects Agency
• ARPANET—Advanced Research Projects Agency Network
• ART—Android Runtime
• AS—Access Server
• ASCII—American Standard Code for Information Interchange
• ASG—Abstract Semantic Graph
• ASK—Amplitude-shift keying
• ASIC—Application-Specific Integrated Circuit
• ASIMO—Advanced Step in Innovative Mobility
• ASLR—Address Space Layout Randomization
• ASM—Algorithmic State Machine
• ASMP—Asymmetric Multiprocessing
• ASN.1—Abstract Syntax Notation 1
• ASP—Active Server Pages
• ASP—Application Service Provider
• ASR—Asynchronous Signal Routine
• AST—Abstract Syntax Tree
• AT—Advanced Technology
• AT—Access Time
• AT—Active Terminator
• ATA—Advanced Technology Attachment
• ATAG—Authoring Tool Accessibility Guidelines
• ATAPI—Advanced Technology Attachment Packet Interface
• ATM—Asynchronous Transfer Mode
• ATT&CK—Adversarial Tactics, Techniques, and Common Knowledge
• AUP—Acceptable use policy
• AuthIP—Authenticated Internet Protocol
• AuthN—Authentication
• AuthZ—Authorization
• AV—Antivirus software
• AVC—Advanced Video Coding
• AVI—Audio Video Interleaved
• AWK—Aho Weinberger Kernighan
• AWS—Amazon Web Services
• AWT—Abstract Window Toolkit

B

• B2B—Business-to-Business
• B2C—Business-to-Consumer
• B2E—Business-to-Employee
• BaaS—Backend as a service
• BaaS—Banking as a service
• BaaS—Blockchain as a service
• BAL—Basic Assembly Language
• BAM—Block Availability Map
• BAN—Body area network
• BAS—Building automation systems
• Bash—Bourne-again shell
• BASIC—Beginner's All-Purpose Symbolic Instruction Code
• BBP—Baseband ProcessorCo
• BBS—Bulletin Board System
• BC—Business Continuity
• BCC—Blind Carbon Copy
• BCD—Binary Coded Decimal
• BCD—Boot Configuration Data
• BCNF—Boyce–Codd normal form
• BCP—Best Current Practice
• BCP—Business continuity planning
• BCS—British Computer Society
• BE—Backend
• BEEP—Blocks Extensible Exchange Protocol
• BER—Basic Encoding Rules
• BER—Bit Error Rate
• BFD—Bidirectional Forwarding Detection
• BFD—Binary File Descriptor
• BFS—Breadth-First Search
• BFT—Byzantine Fault Tolerant
• BGP—Border Gateway Protocol
• BI—Business Intelligence
• BIA—Business impact analysis
• BiDi—Bi-Directional
• bin—binary
• BINAC—Binary Automatic Computer
• BIND—Berkeley Internet Name Domain
• BIOS—Basic Input Output System
• BJT—Bipolar Junction Transistor
• bit—binary digit
• BLISS—Bimodal Lattice Signature Scheme
• Blob—Binary large object
• Blog—Web Log
• BMP—Basic Multilingual Plane
• BNC—Baby Neill Constant
• BOINC—Berkeley Open Infrastructure for Network Computing
• BOM—Byte Order Mark
• BOOTP—Bootstrap Protocol
• BPA—Oracle Business Process Analysis (BPA) Suite
• BPDU—Bridge Protocol Data Units
• BPEL—Business Process Execution Language
• BPL—Broadband over Power Lines
• BPM—Business Process Management
• BPM—Business Process Modeling
• bps—bits per second
• BRM—Business Reference Model
• BRMS—Business Rule Management System
• BRR—Business Readiness Rating
• BRS—Broadband Radio Service
• BSA—Business Software Alliance
• BSB—Backside Bus
• BSD—Berkeley Software Distribution
• BSoD—Blue Screen of Death
• BSS—Block Started by Symbol
• BT—BitTorrent
• BT—Bluetooth
• B TAM—Basic Telecommunications Access Method
• BURS—Bottom-up rewrite system
• BW—Bandwidth
• BYOD—Bring Your Own Device
• Byte—By eight (group of 8 bits)

C

• CA—Certificate authority
• CA—Computer Associates International, Inc.
• CaaS—Content as a service
• CAD—Computer-aided design
• CAE—Computer-aided engineering
• CAID—Computer-aided industrial design
• CAI—Computer-aided instruction
• CAM—Computer-aided manufacturing
• CAN—Campus network
• CAP—Consistency availability partition tolerance (theorem)
• CAPA—Corrective and preventive actiont
• CAPI—Cryptographic Application Programming Interface
• CAPTCHA—Completely automated public Turing test to tell computers and humans apart
• CAQ—Computer-aided quality assurance
• CASB—Cloud access security broker
• CASE—Computer-aided software engineering
• CAT—Computer-aided translation
• Cat—Category rating
• CBC—Cipher block chaining
• CBC-MAC—Cipher block chaining message authentication code
• CBPRNG—Counter-based pseudo-random number generator
• CBRNG—Counter-based random number generator
• cc—C compiler
• CC—Carbon copy
• CC—Creative Commons
• CCE—Common Configuration Enumeration
• CCM—Central control module
• CCM—Cloud Controls Matrix
• CCM—Combined Cipher Machine
• CCMP—CCM mode Protocol
• CCTV—Closed-circuit television
• CCX—Cisco Compatible eXtensions
• CD—Compact Disc
• CDE—Common Desktop Environment
• CDMA—Code-division multiple access
• CDN—Content delivery network
• CDP—Cisco Discovery Protocol
• CDP—Continuous data protection
• CD-R—CD-Recordable
• CD-ROM—CD Read-Only Memory
• CD-RW—CD-Rewritable
• CDSA—Common Data Security Architecture
• CEI—Comparably efficient interconnection
• CER—Canonical Encoding Rules
• CERT—Computer emergency response team
• CES—Consumer Electronics Show
• CF—Compact Flash
• CFB—Cipher feedback
• CFD—Computational fluid dynamics
• CFF—Compact Font Format
• CFG—Context-free grammar
• CFG—Control-flow graph
• CG—Computer graphics
• CGA—Color graphics array
• CGI—Common Gateway Interface
• CGI—Computer-generated imagery
• CGT—Computational Graph Theory
• CHAP—Challenge-Handshake Authentication Protocol
• CHRP—Common Hardware Reference Platform
• CHS—Cylinder–head–sector
• CI/CD—Continuous integration (CI) and continuous delivery (CD)
• CICS—Customer Information Control System
• CIDR—Classless inter-domain routing
• CIFS—Common Internet Filesystem
• CIM—Common Information Model
• CIO—Chief information officer
• CIP—Critical infrastructure protection
• CIR—Committed information rate
• CIS—Center for Internet Security
• CIS—Centre for Internet and Society (India)
• CIS—Computer and information science
• CIS—Comodo Internet Security
• CIS—Contact image sensor
• CIS—Continuous ink system
• CISA—Cybersecurity and Infrastructure Security Agency
• CISC—Complex-instruction-set computer
• CISO—Chief information security officer
• CIT—Center for Information Technology
• CIT—Computer Information Technology
• CJK—Chinese, Japanese, and Korean
• CJKV—Chinese, Japanese, Korean, and Vietnamese
• CLI—Command line interface
• CLR—Common Language Runtime
• CM—Configuration management
• CM—Content management
• CMDB—Configuration management database
• CMM—Capability Maturity Model
• CMMI—Capability Maturity Model Integration
• CMOS—Complementary metal–oxide–semiconductor
• CMS—Content management system
• CN—Canonical Name
• CN—Common Name
• CNC—Computerized numerical control
• —Cryptographic Next Generation
• CNR—Communications and Networking Riser
• CNRI—Corporation for National Research Initiatives
• Coax—Coaxial cabling
• COBOL—Common Business-Oriented Language
• COM—Component Object Model or communication
• ConfigMgr—Microsoft Configuration Manager
• COOP—Continuity of Operations
• COPE—Corporate-owned, personally enabled
• CORBA—Common Object Request Broker Architecture
• CORS—Cross-origin resource sharing
• COTS—Commercial off-the-shelf
• CPA—Cell processor architecture
• CPAN—Comprehensive Perl Archive Network
• CP/CMS—Control Program/Cambridge Monitor System
• CPF—Control Program Facility
• CP/M—Control Program/Monitor
• CPRI—Common Public Radio Interface
• CPS—Characters per second
• CPU—Central processing unit
• CQS—Command–query separation
• CQRS—Command Query Responsibility Segregation
• CR—Carriage return
• CRAN—Comprehensive R Archive Network
• CRC—Cyclic redundancy check
• CRL—Certificate revocation list
• CRLF—Carriage return line feed
• CRM—Customer Relationship Management
• CRS—Computer Reservations System
• CRT—Cathode-ray tube
• CRUD—Create, read, update, and delete
• CS—Cable Select
• CS—Computer science
• CSA—Cloud Security Alliance
• CSE—Computer science and engineering
• CSF—Cybersecurity Framework
• CSi—CompuServe
• CSI—Common System Interface
• CSM—Compatibility support module
• CSMA/CD—Carrier-sense multiple access with collision detection
• CSO—Chief security officer
• CSP—Cloud service provider
• CSP—Communicating sequential processes
• CSP—Cryptographic Service Provider
• CSPRNG—Cryptographically secure pseudorandom number generator
• CSR—Certificate signing request
• CSRF—Cross-site request forgery
• CSS—Cascading style sheets
• CSS—Content-scrambling system
• CSS—Closed-source software
• CSU—Channel service unit
• CSV—Comma-separated values
• CT—Computerized tomography
• cTAKES—clinical Text Analysis and Knowledge Extraction System
• CTAN—Comprehensive TeX Archive Network
• CTCP—Client-to-client protocol
• CTI—Computer telephony integration
• CTFE—Compile-time function execution
• CTL—Computation tree logic
• CTM—Close To Metal
• CTR—Counter mode
• CTS—Clear to send
• CTSS—Compatible Time-Sharing System
• CUA—Common User Access
• C-V2X—Cellular V2X
• CVC—Card Verifiable Certificate
• CVE—Common Vulnerabilities and Exposures
• CVS—Concurrent Versions System
• CVSS—Common Vulnerability Scoring System
• CX—Customer experience

D

• DAC—Digital-to-analog converter
• DAC—Discretionary access control
• DAL—Database Abstraction Layer
• DAO—Data Access Object
• DAO—Data Access Objects
• DAO—Disk-At-Once
• DAP—Directory Access Protocol
• DARPA—Defense Advanced Research Projects Agency
• DAS—Direct Attached Storage
• DAT—Digital Audio Tape
• DB—Database
• DSKT—DesktopDRM
• DBA—Database AdministratorDV
• DBCS—Double Byte Character Set
• DBMS—Database Management System
• DCC—Direct Client-to-Client
• DCCP—Datagram Congestion Control Protocol
• DCCA—Debian Common Core Alliance
• DCL—Data Control Language
• DCS—Distributed Control System
• DCMI—Dublin Core Metadata Initiative
• DCOM—Distributed Component Object Model
• DD—Double Density
• DDE—Dynamic Data Exchange
• DDL—Data Definition Language
• DDoS—Distributed Denial of Service
• DE—Desktop environment
• DDR—Double Data Rate
• DEC—Digital Equipment Corporation
• DEP—Data Execution Prevention
• DER—Distinguished Encoding Rules
• DES—Data Encryption Standard
• —development
• DFA—Deterministic Finite Automaton
• DFD—Data Flow Diagram
• DFS—Depth-First Search
• DFS—Distributed File System
• DGD—Dworkin's Game Driver
• DH—Diffie–Hellman
• DHCP—Dynamic Host Configuration Protocol
• DHTML—Dynamic Hypertext Markup Language
• DIF—Data Integrity Field
• DIMM—Dual Inline Memory Module
• DIN—Deutsches Institut für Normung
• DIP—Dual In-line Package
• DISM—Deployment Image and Service Management Tool
• DIVX—Digital Video Express
• DKIM—DomainKeys Identified Mail
• DL—Download
• DLL—Dynamic-link library
• DLNA—Digital Living Network Alliance
• DLP—Data loss prevention
• DMA—Direct Memory Access
• DMARC—Domain-based Message Authentication, Reporting and Conformance
• DMCA—Digital Millennium Copyright Act
• DMI—Direct Media Interface
• DML—Data Manipulation Language
• DML—Definitive Media Library
• DMR—Dennis M. Ritchie
• DMZ—Demilitarized Zone
• DN—Distinguished Name
• DNAT—Destination network address translation
• DND—Drag-and-Drop
• DNP3—Distributed Network Protocol 3
• DNS—Domain Name System
• DNSBL—Domain Name System blocklist
• DNSSEC—Domain Name System Security Extensions
• DOA—Dead on Arrival
• DOCSIS—Data Over Cable Service Interface Specification
• DoH—DNS over HTTPS
• DOM—Document Object Model
• DORA—Discover, Offer, Request, Acknowledge
• DoS—Denial of Service
• DOS—Disk Operating System
• DoT—DNS over TLS
• DP—Dot Pitch
• DPC—Deferred Procedure Call
• DPI—Deep packet inspection
• DPI—Dots per inch
• DPMI—DOS Protected Mode Interface
• DPMS—Display Power Management Signaling
• DPO—Data Protection Officer or Data Privacy Officer
• DR—Disaster Recovery
• DRAM—Dynamic Random-Access Memory
• DRBG—Deterministic random bit generator
• DR-DOS—Digital Research – Disk Operating System
• DRI—Direct Rendering Infrastructure
• DRM—Digital rights management
• DRM—Direct rendering manager
• DROWN—Decrypting RSA with Obsolete and Weakened eNcryption
• DRP—Disaster recovery plan
• DSA—Digital Signature Algorithm
• DSCP—Differentiated services code point
• DSDL—Document Schema Definition Languages
• DSDM—Dynamic Systems Development Method
• DSL—Digital Subscriber Line
• DSL—Domain-Specific Language
• DSLAM—Digital Subscriber Line Access Multiplexer
• DSN—Database Source Name
• DSN—Data Set Name
• DSP—Digital Signal Processor
• DSRC—Dedicated short-range communications
• DSS—Digital Signature Standard
• DSSS—Direct-sequence spread spectrum
• DSSSL—Document Style Semantics and Specification Language
• DTD—Document Type Definition
• DTE—Data Terminal Equipment or data transfer rate
• DTLS—Datagram Transport Layer Security
• DTO—Data Transfer Object
• DTP—Desktop Publishing
• DTR—Data Terminal Ready or Data transfer rate
• DTSTTCPW—"do the simplest thing that could possibly work"
• Dual_EC_DRBG—Dual Elliptic Curve Deterministic Random Bit Generator
• DV—Domain-validated certificate
• DVD—Digital Versatile Disc or Digital Video Disc
• DVD-R—DVD-Recordable
• DVD-ROM—DVD-Read-Only Memory
• DVD-RW—DVD-Rewritable
• DVI—Digital Visual Interface
• DVR—Digital Video Recorder
• DW—Data Warehouse
• DXVA—DirectX Video Acceleration

E

• EAAF—Enterprise Architecture Assessment Framework
• EAI—Enterprise Application Integration
• EAP—Extensible Authentication Protocol
• EAP-AKA—EAP Authentication and Key Agreement
• EAP-AKA'—EAP Authentication and Key Agreement prime
• EAP-EKE—EAP Encrypted Key Exchange
• EAP-FAST—EAP Flexible Authentication via Secure Tunneling
• EAP-GTC—EAP Generic Token Card
• EAP-IKEv2—EAP Internet Key Exchange v. 2
• EAP-MD5—EAP Message Digest 5
• EAP-NOOB—Nimble out-of-band authentication for EAP
• EAP-POTP—EAP Protected One-Time Password
• EAP-PSK—EAP Pre-Shared Key
• EAP-PWD—EAP Password
• EAP-SIM—EAP Subscriber Identity Module
• EAP-TLS—EAP Transport Layer Security
• EAP-TTLS—EAP Tunneled Transport Layer Security
• EAS—Exchange ActiveSync
• EBCDIC—Extended Binary Coded Decimal Interchange Code
• EBML—Extensible Binary Meta Language
• EBS—Elastic Block Store
• ebXML—Electronic Business using eXtensible Markup Language
• EC2—Elastic Compute Cloud
• ECB—Electronic codebook
• ECC—Elliptic-curve cryptography
• ECDH—Elliptic-curve Diffie–Hellman
• ECDHE—Elliptic-curve Diffie–Hellman Ephemeral
• ECDSA—Elliptic Curve Digital Signature Algorithm
• ECMA—European Computer Manufacturers Association
• ECN—Explicit Congestion Notification
• ECOS—Embedded Configurable Operating System
• ECRS—Expense and Cost Recovery System
• ECS—Entity-Component-System
• ECU—Electronic control unit
• EDA—Electronic Design Automation
• EDGE—Enhanced Data rates for GSM Evolution
• EDI—Electronic Data Interchange
• EDO—Extended Data Out
• EDR—Endpoint detection and response
• EDSAC—Electronic Delay Storage Automatic Calculator
• EDVAC—Electronic Discrete Variable Automatic Computer
• EEPROM—Electronically Erasable Programmable Read-Only Memory
• EF—Exposure factor
• EFF—Electronic Frontier Foundation
• EFI—Extensible Firmware Interface
• EFM—Eight-to-Fourteen Modulation
• EFM—Ethernet in the first mile
• EFS—Encrypting File System
• EGA—Enhanced Graphics Array
• E-mail—Electronic mail
• EGP—Exterior Gateway Protocol
• eID—electronic ID card
• EIDE—Enhanced IDE
• EIGRP—Enhanced Interior Gateway Routing Protocol
• EISA—Extended Industry Standard Architecture
• EJBCA—Enterprise JavaBeans Certificate Authority
• EKE—Encrypted key exchange
• ELF—Extremely Low Frequency
• ELF—Executable and Linkable Format
• ELM—ELectronic Mail
• EMACS—Editor MACroS
• EMCC—Eckert–Mauchly Computer Corporation
• EMI—Electromagnetic interference
• EMM—Enterprise mobility management
• EMS—Expanded Memory Specification
• ENIAC—Electronic Numerical Integrator And Computer
• EOF—End of File
• EOL—End of Life
• EOL—End of Line
• EOM—End of Message
• EOS—End of Support
• EPC—Electronic Product Code
• EPC—Evolved Packet Core
• EPIC—Explicitly Parallel Instruction Computing
• EPP—Endpoint protection platform
• EPROM—Erasable Programmable Read-Only Memory
• ERD—Entity–Relationship Diagram
• ERGS—Electronic Route Guidance System
• ERM—Entity–Relationship Model
• ERP—Enterprise Resource Planning
• eSATA—external SATA
• ESB—Enterprise service bus
• ESCON—Enterprise Systems Connection
• ESD—Electrostatic Discharge
• ESI—Electronically Stored Information
• ESN—Electronic serial number
• ESP—Encapsulating Security Payload
• ESR—Eric Steven Raymond
• ESS—Extended service set
• ETDR—Endpoint threat detection and response
• ETL—Extract, Transform, Load
• EtM—Encrypt-then-MAC
• E&M—Encrypt-and-MAC
• ETW—Event Tracing for Windows
• EUC—Extended Unix Code
• EULA—End User License Agreement
• EWMH—Extended Window Manager Hints
• EXT—EXTended file system
• ETA—Estimated Time of Arrival
• EV—Extended Validation Certificate

F

• FAP—FORTRAN Assembly Program
• FASM—Flat ASseMbler
• FAST—Flexible Authentication via Secure Tunneling
• FAT—File Allocation Table
• FAQ—Frequently Asked Questions
• FBDIMM—Fully Buffered Dual Inline Memory Module
• FC-AL—Fibre Channel Arbitrated Loop
• FCB—File Control Block
• FCS—Frame Check Sequence
• FDC—Floppy-Disk Controller
• FDD—Frequency-Division Duplexing
• FDD—Floppy Disk Drive
• FDE—Full disk encryption
• FDDI—Fiber Distributed Data Interface
• FDM—Frequency-Division Multiplexing
• FDMA—Frequency-Division Multiple Access
• FDS—Fedora Directory Server
• FE—Frontend
• FEC—Forward Error Correction
• FEMB—Front-End Motherboard
• FET—Field Effect Transistor
• FEXT—Far-end crosstalk
• FHS—Filesystem Hierarchy Standard
• FHSS—Frequency-hopping spread spectrum
• FICON—FIber CONnectivity
• FIFO—First In First Out
• FIM—File integrity monitoring
• FIPS—Federal Information Processing Standards
• FIRST—Forum of Incident Response and Security Teams
• FISMA—Federal Information Security Management Act of 2002
• FL—Function Level
• FLAC—Free Lossless Audio Codec
• FLOPS—FLoating-Point Operations Per Second
• FLOSS—Free/Libre/Open-Source Software
• FMC—Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• FNV—Fowler–Noll–Vo
• FOLDOC—Free On-line Dictionary of Computing
• FORTRAN—Formula Translation
• FOSDEM—Free and Open-source Software Developers' European Meeting
• FOSI—Formatted Output Specification Instance
• FOSS—Free and Open-Source Software
• FP—Function Programming
• FP—Functional Programming
• FPGA—Field-programmable gate array
• FPS—Floating Point Systems
• FPU—Floating-Point Unit
• FRR—False Rejection Rate
• FRU—Field-Replaceable Unit
• FS—File System
• FS—Forward secrecy
• FSB—Front-Side Bus
• fsck—File System Check
• FSF—Free Software Foundation
• FSM—Finite State Machine
• FTP—File Transfer Protocol
• FTPS—FTP-SSL or FTP Secure
• FTTC—Fiber To The Curb
• FTTH—Fiber To The Home
• FTTP—Fiber To The Premises
• FQDN—Fully Qualified Domain Name
• FUD—Fear Uncertainty Doubt
• FWS—Folding White Space
• FXP—File eXchange Protocol
• FYI—For Your Information

G

• G11N—Globalization
• GADS—Gateway Algorithms and Data Structures
• Gas—GNU Assembler
• Gb—Gigabit
• GB—Gigabyte
• Gbps—Gigabits per second
• GC—Garbage collection
• GCC—GNU Compiler Collection
• GCJ—GNU Compiler for Java
• GCM—Galois/Counter Mode
• GCP—Google Cloud Platform
• GCR—Group Coded Recording
• GDB—GNU Debugger
• GDI—Graphics Device Interface
• GDPR—General Data Protection Regulation
• GEM—Graphics Environment Manager
• GFDL—GNU Free Documentation License
• GIF—Graphics Interchange Format
• GIGO—Garbage In, Garbage Out
• GIMP—GNU Image Manipulation Program
• GIMPS—Great Internet Mersenne Prime Search
• GIS—Geographic Information System
• GLUT—OpenGL Utility Toolkit
• GML—Geography Markup Language
• GNOME—GNU Network Object Model Environment
• GNU—GNU's Not Unix
• GnuPG or GNU—GNU Privacy Guard
• GnuTLS—GNU Transport Layer Security
• GOMS—Goals, Operators, Methods, and Selection rules
• GPASM—GNU PIC ASseMbler
• GPFS—General Parallel File System
• GPG—GNU Privacy Guard
• GPGPU—General-Purpose Computing on Graphics Processing Units
• GPIB—General-Purpose Instrumentation Bus
• GPL—General Public License
• GPL—General-Purpose Language
• GPO—Group Policy Object
• GPRS—General Packet Radio Service
• GPT—GUID Partition Table
• GPU—Graphics Processing Unit
• GRASP—General Responsibility Assignment Software Patterns
• GRE—Generic routing encapsulation
• GRUB—Grand Unified Boot-Loader
• GERAN—GSM EDGE Radio Access Network
• GSM—Global System for Mobile Communications
• GTC—Generic Token Card
• GTK/GTK+—GIMP Toolkit
• GUI—Graphical user interface
• GUID—Globally Unique IDentifier
• GWT—Google Web Toolkit

H

• HA—High availability
• HAL—Hardware Abstraction Layer
• HAN—Home network
• HASP—Houston Automatic Spooling Priority
• HBA—Host Bus Adapter
• HCI—Human—Computer Interaction
• HD—High Density
• HDD—Hard Disk Drive
• HCL—Hardware Compatibility List
• HD DVD—High Definition DVD
• HDL—Hardware Description Language
• HDMI—High-Definition Multimedia Interface
• HECI—Host Embedded Controller Interface
• HF—High Frequency
• HFS—Hierarchical File System
• HHD—Hybrid Hard Drive
• HID—Human Interface Device
• HIDS—Host-based intrusion detection system
• HIG—Human Interface Guidelines
• HIPS—Host-based intrusion prevention system
• HIRD—Hurd of Interfaces Representing Depth
• HLASM—High Level ASseMbler
• HLR—Home location register
• HLS—HTTP Live Streaming
• HMA—High Memory Area
• HMAC—Hash-based message authentication code
• HMI—Human–machine interface
• HOTP—HMAC-based one-time password
• HP—Hewlett-Packard
• HPC—High-Performance Computing
• HPFS—High Performance File System
• HSDPA—High-Speed Downlink Packet Access
• HTC—High-Throughput Computing
• HSM—Hardware security module
• HSM—Hierarchical storage management
• HT—Hyper Threading
• HTM—Hierarchical Temporal Memory
• HTML—Hypertext Markup Language
• HTTP—Hypertext Transfer Protocol
• HTTPd—Hypertext Transport Protocol Daemon
• HTTPS—HTTP Secure
• HTX—HyperTransport eXpansion
• HURD—Hird of Unix-Replacing Daemons
• HVD—Holographic Versatile Disc
• Hz—Hertz

I

• I²C—Inter-Integrated Circuit
• I²S—Integrated Interchip Sound
• I18N—Internationalization
• IaaS—Infrastructure as a Service
• IAB—Internet Architecture Board
• IaC—Infrastructure as Code
• IAM—Identity and access management
• IANA—Internet Assigned Numbers Authority
• iBCS—Intel Binary Compatibility Standard
• IBM—International Business Machines
• IBSS—Independent basic service set
• IC—Integrated Circuit
• ICANN—Internet Corporation for Assigned Names and Numbers
• ICE—In-Circuit Emulator
• ICE—Intrusion Countermeasure Electronics
• ICH—I/O Controller Hub
• ICL—International Computers Limited
• ICMP—Internet Control Message Protocol
• ICP—Internet Cache Protocol
• ICS—Industrial control system
• ICS—Internet Connection Sharing
• ICT—Information and Communication Technology
• IDE—Integrated Development Environment
• IDE—Integrated Drive Electronics
• IDEA—International Data Encryption Algorithm
• IDF—Intermediate Data Format
• IDF—Intermediate Distribution Frame
• IDL—Interactive Data Language
• IDL—Interface Definition Language
• IDN—Internationalized domain name
• IdP—Identity provider (cybersecurity)
• IDPS—Intrusion detection and prevention system
• IDS—Intrusion Detection System
• IE—Internet Explorer
• IEC—International Electrotechnical Commission
• IED—Intelligent electronic device
• IEEE—Institute of Electrical and Electronics Engineers
• IEN—Internet Experiment Note
• IETF—Internet Engineering Task Force
• IFL—Integrated Facility for Linux
• IGMP—Internet Group Management Protocol
• IGRP—Interior Gateway Routing Protocol
• IHV—Independent Hardware Vendor
• IIOP—Internet Inter-Orb Protocol
• IIoT—Industrial internet of things
• IIS—Internet Information Services
• IKE—Internet Key Exchange
• IL—Intermediate Language
• IM—Instant Message or Instant Messaging
• IMAP—Internet Message Access Protocol
• IME—Input Method Editor
• INN—InterNetNews
• INFOSEC—Information Systems Security
• I/O—Input/output
• IoT—Internet of things
• IoC—Indicator of compromise
• IoC—Inversion of control
• IP—Intellectual Property
• IP—Internet Protocol
• IPAM—IP Address Management
• IPC—Inter-Process Communication
• IPL—Initial Program Load
• IPMI—Intelligent Platform Management Interface
• IPO—Inter Procedural Optimization
• IPP—Internet Printing Protocol
• IPS—In-Plane Switching
• IPS—Instructions Per Second
• IPS—Intrusion Prevention System
• IPSJ—Information Processing Society of Japan
• IPsec—Internet Protocol Security
• IPTV—Internet Protocol Television
• IPv4—Internet Protocol version 4
• IPv6—Internet Protocol version 6
• IPX—Internetwork Packet Exchange
• IR—Intermediate representation
• IRC—Internet Relay Chat
• IrDA—Infrared Data Association
• IRE—Institute of Radio Engineers
• IRI—Internationalized Resource Identifier
• IRP—I/O Request Packet
• IRQ—Interrupt Request
• IRT—Incident response team
• IS—Information Systems
• IS-IS—Intermediate System to Intermediate System
• ISA—Industry Standard Architecture
• ISA—Instruction Set Architecture
• ISAC—Information Sharing and Analysis Center
• ISAKMP—Internet Security Association and Key Management Protocol
• ISAM—Indexed Sequential Access Method
• ISAP—Information Security Automation Program
• ISATAP—Intra-Site Automatic Tunnel Addressing Protocol
• ISC—Internet Storm Center
• iSCSI—Internet Small Computer System Interface
• ISDN—Integrated Services Digital Network
• ISO—International Organization for Standardization
• ISOC—Information security operations center
• ISOC—Internet Society
• iSNS—Internet Storage Name Service
• ISP—Internet Service Provider
• ISPF—Interactive System Productivity Facility
• ISR—Interrupt Service Routine
• ISRG—Internet Security Research Group
• ISSA—Information Systems Security Association
• ISV—Independent Software Vendor
• IT—Information Technology
• ITIL—Information Technology Infrastructure Library
• ITL—Interval Temporal Logic
• ITS—Intelligent transportation system
• ITU—International Telecommunication Union
• ITU-T—International Telecommunication Union Telecommunication Standardization Sector
• IV—Initialization vector
• IVR(S)—Interactive Voice Response (System)

J

• J2EE—Java 2 Enterprise Edition
• J2ME—Java 2 Micro Edition
• J2SE—Java 2 Standard Edition
• JAAS—Java Authentication and Authorization Service
• JATS—Journal Article Tag Suite
• JAXB—Java Architecture for XML Binding
• JAX-RPC—Jakarta XML (formerly Java XML) for Remote Procedure Calls
• JAXP—Java API for XML Processing
• JBOD—Just a Bunch of Disks
• JCE Java Cryptography Extension
• JCL—Job Control Language
• JCP—Java Community Process
• JDBC—Java Database Connectivity
• JDK—Java Development Kit
• JEE—Java Enterprise Edition
• JES—Job Entry Subsystem
• JDS—Java Desktop System
• JFC—Java Foundation Classes
• JFET—Junction Field-Effect Transistor
• JFS—IBM Journaling File System
• JINI—Jini Is Not Initials
• JIT—Just-In-Time
• JME—Java Micro Edition
• JMX—Java Management Extensions
• JMS—Java Message Service
• JNDI—Java Naming and Directory Interface
• JNI—Java Native Interface
• JNZ—Jump non-zero
• JPEG—Joint Photographic Experts Group
• JRE—Java Runtime Environment
• JS—JavaScript
• JSE—Java Standard Edition
• JSON—JavaScript Object Notation
• JSP—Jackson Structured Programming
• JSP—JavaServer Pages
• JTAG—Joint Test Action Group
• JVM—Java Virtual Machine
• JWE—JSON Web Encryption
• JWS—JSON Web Signature
• JWT—JSON Web Token

K

• K&R—Kernighan and Ritchie
• K8s—Kubernetes
• Kb—Kilobit
• KB—Keyboard
• KB—Kilobyte
• KB—Knowledge Base
• Kbps—Kilobits per second
• KC—Keyboard computer
• KDC—Key distribution center
• KDE—K Desktop Environment
• KDF—Key derivation function
• KEK—Key encryption key
• kHz—Kilohertz
• KiB—Kibibyte
• KINK—Kerberized Internet Negotiation of Keys
• KML—Keyhole Markup Language
• KMS—Kernal Mode Setting
• KMS—Key Management Server
• KMS—Knowledge Management System
• KPOP—Kerberized Post Office Protocol
• KRACK—Key Reinstallation Attack
• KPK—Key production key
• KRL—Knowledge Representation Language
• KVM—Keyboard, Video, Mouse

L

• L10N—Localization
• L2TP—Layer 2 Tunneling Protocol
• LACP—Link Aggregation Control Protocol
• LAMP—Linux Apache MySQL Perl
• LAMP—Linux Apache MySQL PHP
• LAMP—Linux Apache MySQL Python
• LAN—Local Area Network
• LATA—Local Access and Transport Area
• LBA—Logical Block Addressing
• LB—Load Balancer
• LBAC—Lattice-based access control
• LCD—Liquid Crystal Display
• LCDP—Low-code development platform
• LCOS—Liquid Crystal On Silicon
• LCR—Least Cost Routing
• LDAP—Lightweight Directory Access Protocol
• LDIF—LDAP Data Interchange Format
• LE—Logical Extents
• LEAP—Lightweight Extensible Authentication Protocol
• LED—Light-emitting diode
• LF—Line Feed
• LF—Low Frequency
• LFS—Linux From Scratch
• LGA—Land Grid Array
• LGPL—Lesser General Public License
• LIB—LIBrary
• LIF—Low Insertion Force
• LIFO—Last In First Out
• LILO—Linux Loader
• LISP—LISt Processing
• LKML—Linux Kernel Mailing List
• LLC—Logical link control
• LM—Lan Manager
• LOC—Lines of Code
• LPC—Lars Pensjö C
• LPI—Linux Professional Institute
• LPT Line Print Terminal
• LRU—Least Recently Used
• LSB—Least Significant Bit
• LSB—Linux Standard Base
• LSI—Large-Scale Integration
• LTE—Long Term Evolution
• LTL—Linear Temporal Logic
• LTR—Left-to-Right
• LTS—Long-term support
• LUG—Linux User Group
• LUN—Logical Unit Number
• LV—Logical Volume
• LVD—Low Voltage Differential
• LVM—Logical Volume Management
• LZW—Lempel-Ziv-Welch

M

• MaaS—Mobility as a service
• MaaS—Monitoring as a service
• MAAWG—Messaging Anti-Abuse Working Group
• MAC—Mandatory access control
• MAC—Medium access control
• MAC—Message authentication code
• MANET—Mobile Ad-Hoc Network
• MAN—Metropolitan Area Network
• MAPI—Messaging Application Programming Interface
• MAPS—Mail Abuse Prevention System
• MAU—Media access unit
• MAU—Medium Attachment Unit
• MAWI—Measurement and Analysis on the WIDE Internet
• Mb—Megabit
• MB—Megabyte
• MBCS—Multi Byte Character Set
• MBD—Model-Based Design
• Mbps—Megabits per second
• MBR—Master Boot Record
• MBSS—Mesh basic service set
• MCA—Micro Channel Architecture
• MCA—Microsoft Certified Architect
• MCAD—Microsoft Certified Application Developer
• MCAS—Microsoft Certified Application Specialist
• MCC or MVCC—Multiversion concurrency control
• MCDBA—Microsoft Certified DataBase Administrator
• MCDST—Microsoft Certified Desktop Support Technician
• MCITP—Microsoft Certified Information Technology Professional
• MCM—Microsoft Certified Master
• MCP—Microsoft Certified Professional
• MCPD—Microsoft Certified Professional Developer
• MCSA—Microsoft Certified Systems Administrator
• MCSD—Microsoft Certified Solution Developer
• MCSE—Microsoft Certified Systems Engineer
• MCT—Microsoft Certified Trainer
• MCTS—Microsoft Certified Technology Specialist
• MD—Message Digest (MD2, MD4, MD5, MD6)
• MDA—Monochrome Display Adapter
• MDA—Mail Delivery Agent
• MDA—Model-Driven Architecture
• MDD/MDSD—Model-Driven (Software) Development
• MDF—Main Distribution Frame
• MDI—Multiple-Document Interface
• MDM—Master data management
• MDM—Mobile device management
• ME—Microsoft Edge
• ME—[Windows] Millennium Edition
• MF—Medium Frequency
• MFA—Multi-factor authentication
• MFC—Microsoft Foundation Classes
• MFD—Multi-function device
• MFJ—Modification of Final Judgment
• MFM—Modified Frequency Modulation
• MFP—Multi-function printer
• MFT—Master File Table
• MGCP—Media Gateway Control Protocol
• MHz—Megahertz
• MIB—Management Information Base
• MIC—Message integrity code
• MICKEY—Mutual Irregular Clocking KEYstream generator
• MICR—Magnetic Ink Character Recognition or Magnetic Ink Character Reader
• MIDI—Musical Instrument Digital Interface
• MIMD—Multiple Instruction, Multiple Data
• MIME—Multipurpose Internet Mail Extensions
• MIMO—Multiple-Input Multiple-Output
• MINIX—MIni-uNIX
• MIPS—Microprocessor without Interlocked Pipeline Stages
• MIPS—Million Instructions Per Second
• MISD—Multiple Instruction, Single Data
• MIS—Management Information Systems
• MIT—Massachusetts Institute of Technology
• ML—Machine Learning
• MMC—Microsoft Management Console
• MMC—MultiMediaCard
• MMDS—Mortality Medical Data System
• MMDS—Multichannel Multipoint Distribution Service
• MMF—Multi-Mode (optical) Fiber
• MM fonts—Multiple master fonts
• MMIO—Memory-Mapped I/O
• MMI—Man Machine Interface
• MMF—Multi-mode fiber
• MMORPG—Massively Multiplayer Online Role-Playing Game
• MMS—Multimedia Message Service
• MMU—Memory Management Unit
• MMX—Multi-Media Extensions
• MNG—Multiple-image Network Graphics
• MoBo—Motherboard
• MOM—Message-Oriented Middleware
• MOO—MUD Object Oriented
• MOP—Meta-Object Protocol
• MOSFET—Metal-Oxide Semiconductor Field Effect Transistor
• MOS—Microsoft Office Specialist
• MOTD—Message Of The Day
• MoU—Memorandum of understanding
• MOUS—Microsoft Office User Specialist
• MOV—Apple QuickTime Multimedia File
• MPAA—Motion Picture Association of America
• MPEG—Motion Pictures Experts Group
• MPLS—Multiprotocol Label Switching
• MPL—Mozilla Public License
• MPU—Microprocessor Unit
• MQTT—Message Queues Telemetry Transport
• MS—Memory Stick
• MS—Microsoft
• MSA—Master service agreement
• MSA—Message submission agent
• MSB—Most Significant Bit
• MS-CHAP—Microsoft version of the Challenge-Handshake Authentication Protocol
• MSDN—Microsoft Developer Network
• MS-DOS—Microsoft Disk Operating System
• MSI—Medium-Scale Integration
• MSI—Message Signaled Interrupt
• MSI—Microsoft Installer
• MSMQ—Microsoft Message Queuing
• MSN—Microsoft Network
• MSP—Managed service provider
• MSS—Managed security service
• MSSP—Managed security service provider
• MT—Machine Translation
• MTA—Mail Transfer Agent
• MTA—Microsoft Technology Associate
• MTBF—Mean time between failures
• MtE—MAC-then-Encrypt
• MTS—Michigan Terminal System
• MTTF—Mean time to failure
• MTTR—Mean time to repair
• MTU—Maximum Transmission Unit
• MU—Memory Unit
• MUA—Mail User Agent
• MUD—Multi-User Dungeon
• MVC—Model-View-Controller
• MVP—Most Valuable Professional
• MVS—Multiple Virtual Storage
• MWC—Mobile World Congress
• MWN—Municipal wireless network
• MXF—Material Exchange Format
• MX—Mail exchange

N

• NAC—Network access control
• NACK—Negative ACKnowledgement
• NAIC—National Infrastructure Advisory Council
• NAK—Negative AcKnowledge Character
• NaN—Not a Number
• NAP—Network Access Protection
• NAPT—Network address and port translation
• NAS—Network access server
• NAS—Network-attached storage
• NASL—Nessus Attack Scripting Language
• NASM—Netwide ASseMbler
• NAT—Network address translation
• NAT-T—Network address translator traversal
• NBO—Northbound interface
• NCDP—No-code development platform
• NCP—NetWare Core Protocol
• NCQ—Native Command Queuing
• NCR—National Cash Register
• NCSA—National Center for Supercomputing Applications
• NDIS—Network Driver Interface Specification
• NDP—Neighbor Discovery Protocol
• NDPS—Novell Distributed Print Services
• NDS—Novell Der irectory Services
• NEP—Network Equipment Provider
• NetBIOS—Network Basic Input/Output System
• NetBT—NetBIOS over TCP/IP
• NEXT—Near-end crosstalk
• NFA—Nondeterministic Finite Automaton
• NFC—Near-field communication
• NFS—Network File System
• NGFW—Next-generation firewall
• NGSCB—Next-Generation Secure Computing Base
• NI—National Instruments
• NIC—Network Interface Controller or Network Interface Card
• NIDS—Network intrusion detection systems
• NII—National Information Infrastructure
• NIM—No Internal Message
• NIO—Non-blocking I/O
• NIPS—Network-based intrusion prevention system
• NIST—National Institute of Standards and Technology
• NLE—Non-Linear Editing system
• NLP—Natural Language Processing
• NLS—Native Language Support
• NMI—Non-Maskable Interrupt
• NNRP—Network News Reader Protocol
• NNTP—Network News Transfer Protocol
• NOC—Network Operations Center
• NOOB—Nibble out-of-band authentication
• NOP—No OPeration
• NOS—Network Operating System
• NP—Nondeterministic Polynomial time
• NPL—Netscape Public License
• NPPD—National Protection and Programs Directorate
• NPTL—Native POSIX Thread Library
• NPU—Network Processing Unit
• NS—Netscape
• NSIS—Nullsoft Scriptable Install System
• NSN—Network service name
• NSPR—Netscape Portable Runtime
• NSS—Novell Storage Service
• NSS—Network Security Services
• NSS—Name Service Switch
• NT—New Technology
• NTFS—New Technology File System
• NTLM—New Technology LAN Manager
• NTP—Network Time Protocol
• NUM|A—Non-Uniform Memory Access
• NURBS—Non-Uniform Rational B-Spline
• NUT—Network UPS Tools
• NVD—National Vulnerability Database
• NVMe—NVM Express
• NVR—Network Video Recorder
• NVRAM—Non-Volatile Random-Access Memory
• NX—No-execute

O

• OASIS—Organization for the Advancement of Structured Information Standards
• OAS—Oracle Advanced Security
• OAT—Operational Acceptance Testing
• OAuth—Open Authorization
• OBSAI—Open Base Station Architecture Initiative
• OCR—Optical Character Recognition
• OCSP—Online Certificate Status Protocol
• ODBC—Open Database Connectivity
• OEM—Original Equipment Manufacturer
• OES—Open Enterprise Server
• OFDM—Orthogonal frequency-division multiplexing
• OFTC—Open and Free Technology Community
• OFX—Open Financial eXchange
• OID—Object Identifier
• OKV—Oracle Key Vault
• OLAP—Online Analytical Processing
• OLE—Object Linking and Embedding
• OLED—Organic light-emitting diode
• OLPC—One Laptop per Child
• OLTP—Online Transaction Processing
• OMF—Object Module Format
• OMG—Object Management Group
• OMR—Optical Mark Reader
• OMTP—Open Mobile Terminal Platform
• ONS—Oracle Net Services
• ooRexx—Open Object Rexx
• OO—Object-Oriented
• OO—OpenOffice
• OOE—Out-of-Order Execution
• OOM—Out Of Memory
• OOo—OpenOffice.org
• OoOE—Out-of-Order Execution
• OOP—Object-Oriented Programming
• OOTB—Out of the box
• OPML—Outline Processor Markup Language
• ORB—Object Request Broker
• ORBS—Open Relay Behavior-modification System
• ORM—Object–Relational Mapping
• OS—Open Source
• OS—Operating System
• OSCON—O'Reilly Open Source CONvention
• OSDN—Open Source Development Network
• OSI—Open Source Initiative
• OSI—Open Systems Interconnection
• OSINT—Open source intelligence
• OSPF—Open Shortest Path First
• OSS—Open Sound System
• OSS—Open-source software
• OSS—Operations Support System
• OSSTMM—Open Source Security Testing Methodology Manual
• OSTG—Open Source Technology Group
• OT—Operational technology
• OTP—One-time password
• OUI—Organizationally Unique Identifier
• OV—Organization validation
• OVAL—Open Vulnerability and Assessment Language
• OWASP—Open Worldwide Application Security Project
• OWE—Opportunistic Wireless Encryption

P

• P2P—Peer-To-Peer
• PaaS—Platform as a Service
• PAC—Proxy auto-config
• PAM—Pluggable Authentication Module
• PAM—Privileged Access Management
• PAN—Personal Area Network
• PAP—Password Authentication Protocol
• PARC—Palo Alto Research Center
• PAPR—Power Architecture Platform Reference
• PAT—Port address translation
• PATA—Parallel ATA
• PBKDF2—Password-Based Key Derivation Function 2
• PBS—Portable Batch System
• PBX—Private branch exchange
• PC—Personal Computer
• pcap—packet capture
• PCB—Printed Circuit Board
• PCB—Process Control Block
• PC DOS—Personal Computer Disc Operating System
• PCI—Peripheral Component Interconnect
• PCI DSS—Payment Card Industry Data Security Standard
• PCIe—PCI Express
• PCI-X—PCI Extended
• PCL—Printer Command Language
• PCMCIA—Personal Computer Memory Card International Association
• PCM—Pulse-Code Modulation
• PCRE—Perl Compatible Regular Expressions
• PD—Public Domain
• PDA—Personal Digital Assistant
• PDF—Portable Document Format
• PDH—Plesiochronous Digital Hierarchy
• PDP—Programmed Data Processor
• PDU—Power distribution unit
• PDU—Protocol data unit
• PE—Physical Extents
• PE—Portable Executable
• PEAP—Protected Extensible Authentication Protocol
• PEM—Privacy-Enhanced Mail
• PERL—Practical Extraction and Reporting Language
• PERMIS—PrivilEge and Role Management Infrastructure Standards
• PES—Proposed Encryption Standard
• PFS—Perfect forward secrecy
• PG—Peripheral Gateway
• PGA—Pin Grid Array
• PGA—Programmable Gate Array
• PGO—Profile-Guided Optimization
• PGP—Pretty Good Privacy
• PHIPA—Personal Health Information Protection Act
• PHP—Hypertext Preprocessor
• PHR—Personal health record
• PHY—Physical layer
• PIC—Peripheral Interface Controller
• PIC—Programmable Interrupt Controller
• PID—Proportional-Integral-Derivative
• PID—Process ID
• PII—Personally identifiable information
• PIM—Personal Information Manager
• PINE—Program for Internet News and Email
• PING—Packet Internet Gopher
• PIO—Programmed Input/Output
• PIPEDA—Personal Information Protection and Electronic Documents Act
• PIR—Public Interest Registry
• PIV—FIPS 201
• Pixel—Picture element
• PKCS—Public Key Cryptography Standards
• PKI—Public Key Infrastructure
• PLC—Power-Line Communication
• PLC—Programmable logic controller
• PLD—Programmable logic device
• PL/I—Programming Language One
• PL/M—Programming Language for Microcomputers
• PL/P—Programming Language for Prime
• PLT—Power-Line Telecommunications
• PMM—POST Memory Manager
• PNAC—Port-based network access control
• PNA—Personal Navigation Assistant
• PNG—Portable Network Graphics
• PnP—Plug-and-Play
• PNRP—Peer Name Resolution Protocol
• POCE—Personally owned, company enabled
• POCO—Plain Old Class Object
• PoE—Power over Ethernet
• POID—Persistent Object Identifier
• POJO—Plain Old Java Object
• POODLE—Padding Oracle On Downgraded Legacy Encryption
• PoP—Point of Presence
• POP3—Post Office Protocol v3
• PoS—Point of Sale
• POSIX—Portable Operating System Interface, formerly IEEE-IX
• POST—Power-On Self Test
• POTP—Protected One-Time Password
• POTS—Plain old telephone service
• PPC—PowerPC
• PPI—Pixels Per Inch
• PPM—Pages Per Minute
• PPP—Point-to-Point Protocol
• PPPoA—PPP over ATM
• PPPoE—PPP over Ethernet
• PPTP—Point-to-Point Tunneling Protocol
• PR—Pull Request
• PReP—PowerPC Reference Platform
• PRNG—Pseudorandom number generator
• PROM—Programmable Read-Only Memory
• PS—PostScript
• PS/2—Personal System/2
• PSA—Professional Services Automation
• PSK—Pre-shared key
• PSM—Platform Specific Model
• PSTN—Public Switched Telephone Network
• PSU—Power Supply Unit
• PSVI—Post-Schema-Validation Infoset
• PTS-DOS—PhysTechSoft – Disk Operating System
• PTZ—Pan–tilt–zoom camera
• PUA—Potentially unwanted application
• PUP—Potentially unwanted program
• PV—Physical volume
• PV—Process variable
• PVG—Physical volume group
• PVR—Personal Video Recorder
• PXE—Preboot Execution Environment
• PXI—PCI eXtensions for Instrumentation
• PRC—Procedure Remote Call

Q

• QA—Quality assurance
• QC—Quality control
• QC—Quick Charge
• QDR—Quad Data Rate
• QEMU—Quick Emulator
• QFP—Quad Flat Package
• QIF—Quicken Interchange Format
• QoS—Quality of Service
• QOTD—Quote of the Day
• QSOP—Quarter-size small-outline package
• Qt—a cross-platform application development framework for creating graphical user interfaces as well as applications that run on various software and hardware platforms
• QTAM—Queued Teleprocessing Access Method

R

• RA—Registration authority
• RAB—Rapid application building
• RACE—Research and Development in Advanced Communications Technologies in Europe
• RACF—Resource Access Control Facility
• RAD—Rapid application development
• RADIUS—Remote Authentication Dial-In User Service
• RAID—Redundant Array of Independent Disks
• RAII—Resource Acquisition Is Initialization
• RAIT—Redundant Array of Inexpensive Tapes
• RAM—Random-Access Memory
• RAM—Reliability, Availability, and Maintainability
• RAN—Radio access network
• RARP—Reverse Address Resolution Protocol
• RAS—Reliability, Availability, and Serviceability
• RAS—Remote access service
• RAT—Radio access technology
• RAT—Remote access trojan
• RBAC—Role-based access control
• RC—Region Code
• RC—Release Candidate
• RC—Run Commands
• RC2—Rivest Cipher 2 (a block cipher)
• RC4—Rivest Cipher 4 (a stream cipher)
• RC5—Rivest Cipher 5 (a block cipher)
• RC6—Rivest Cipher 6 (a block cipher)
• RCA—Root Cause Analysis
• RCS—Revision Control System
• RD—Remote Desktop
• rd—remove directory
• RDBMS—Relational Database Management System
• RDC—Remote Desktop Connection
• RDF—Resource Description Framework
• RDM—Relational Data Model
• RDOS—Real-time Disk Operating System
• RDP—Remote Desktop Protocol
• RDS—Remote Desktop Services
• REFAL—Recursive Functions Algorithmic Language
• REST—Representational State Transfer
• regex—Regular Expression
• regexp—Regular Expression
• RF—Radio Frequency
• RFB—Remote FrameBuffer
• RFC—Request For Comments
• RFI—Radio Frequency Interference
• RFID—Radio-frequency identification
• RG—Radio Guide
• RGB—Red, Green, Blue
• RHL—Red Hat Linux
• RHEL—Red Hat Enterprise Linux
• REXX—Restructured Extended Executor Language
• RIA—Rich Internet Application
• RIAA—Recording Industry Association of America
• RIP—Raster Image Processor
• RIP—Routing Information Protocol
• RIPE—Réseaux IP Européens
• RIPEMD—RACE Integrity Primitives Evaluation Message Digest
• RIPEMD—RIPE Message Digest
• RIR—Regional Internet registry
• RISC—Reduced Instruction Set Computer
• RISC OS—Reduced Instruction Set Computer Operating System
• RJ—Registered jack
• RJE—Remote Job Entry
• RLE—Run-Length Encoding
• RLL—Run-Length Limited
• rmdir—remove directory
• RMF—Risk Management Framework
• RMI—Remote Method Invocation
• RMS—Richard Matthew Stallman
• ROM—Read-Only Memory
• ROMB—Read-Out Motherboard
• ROM-DOS—Read-Only Memory – Disk Operating System
• RPA—Robotic Process Automation
• RPC—Remote Procedure Call
• RPG—Report Program Generator
• RPM—RPM Package Manager
• RPO—Recovery Point Objective
• RRAS—Routing and Remote Access Service
• RRSIG—Resource record signature
• RSA—Rivest Shamir Adleman
• RSBAC—Rule-set-based access control
• RSI—Repetitive Strain Injury
• RSR—Rapid Security Response
• RSS—Radio Service Software
• RSS—Remote service software
• RSS—Rich Site Summary, RDF Site Summary, or Really Simple Syndication
• RST—reStructuredText
• RSTP—Rapid Spanning Tree Protocol
• RSVP—Resource Reservation Protocol
• RTAI—Real-Time Application Interface
• RTBH—Remote Triggered Black Hole Filtering
• RTC—Real-Time Clock
• RTD—Round-trip delay
• RTE—Real-Time Enterprise
• RTEMS—Real-Time Executive for Multiprocessor Systems
• RTF—Rich Text Format
• RTL—Right-to-Left
• RTMP—Real Time Messaging Protocol
• RTO—Recovery Time Objective
• RTOS—Real-Time Operating System
• RTP—Real-time Transport Protocol
• RTS—Ready To Send
• RTSP—Real-Time Streaming Protocol
• RTT—Round-trip time
• RTTI—Run-time Type Information
• RTU—Remote Terminal Unit
• RWD—Responsive Web Design

S

• S3—Simple Storage Service
• SA—Security association
• SaaS—Software as a Service
• SAE—Simultaneous Authentication of Equals
• SAE—System Architecture Evolution
• SASE—Secure access service edge
• SASS—Syntactically Awesome Style Sheets
• SAM—Security Account Manager
• SAML—Security Assertion Markup Language
• SAN—Storage Area Network
• SAN—Subject Alternative Name
• SAS—Serial attached SCSI
• SASE—Secure access service edge
• SASE—Stand-alone synchronization equipment
• SASL—Simple Authentication and Security Layer
• SATA—Serial AT Attachment
• SAX—Simple API for XML
• SBOD—Spinning Beachball of Death
• SBP-2—Serial Bus Protocol 2
• sbin—superuser binary
• sbs—Small Business Server
• SCADA—Supervisory Control and Data Acquisition
• SCAP—Security Content Automation Protocol
• SCEP—Simple Certificate Enrollment Protocol
• SCCM—System Center Configuration Manager
• SCID—Source Code in Database
• SCM—Software Configuration Management
• SCM—Source Code Management
• SCO—Santa Cruz Operation
• SCP—Seattle Computer Products
• SCP—Secure copy protocol
• SCRAM—Salted Challenge Response Authentication Mechanism
• SCSI—Small Computer System Interface
• SCTP—Stream Control Transmission Protocol
• SD—Secure Digital
• SDD—Software design description
• SDDC—Software-defined data center
• SDDL—Security Descriptor Definition Language
• SDH—Synchronous Digital Hierarchy
• SDI—Single-Document Interface
• SDIO—Secure Digital Input Output
• SDK—Software Development Kit
• SDL—Simple DirectMedia Layer
• SDLC—Software development life cycle
• SDN—Software-defined networking
• SDP—Session Description Protocol
• SDP—Software-defined perimeter
• SDP—Software-defined protection
• SDR—Software-Defined Radio
• SDRAM—Synchronous Dynamic Random-Access Memory
• SDSL—Symmetric digital subscriber line
• SD-WAN—Software-Defined Wide Area Network
• SDXF—Structured Data eXchange Format
• SE—Single Ended
• SECC—Single-Edged Contact Cartridge
• SED—Self-encrypting drive
• SEH—Structured Exception Handling
• SEI—Software Engineering Institute
• SELinux—Security-Enhanced Linux
• SEO—Search Engine Optimization
• SFC—Sequential function chart
• SFC—System File Checker
• SFTP—Secure File Transfer Protocol
• SFTP—Simple File Transfer Protocol
• SFTP—SSH File Transfer Protocol
• SGI—Silicon Graphics, Incorporated
• SGML—Standard Generalized Markup Language
• SGR—Select Graphic Rendition]]
• SGX—Software Guard eXtensions
• SHA—Secure Hash Algorithms
• SHA-1—Secure Hash Algorithm 1
• SHA-2—Secure Hash Algorithm 2
• SHA-3—Secure Hash Algorithm 3
• SHDSL—Single-pair High-speed Digital Subscriber Line
• S-HTTP—Secure Hypertext Transfer Protocol
• SIEM—Security information and event management
• SIGCAT—Special Interest Group on CD-ROM Applications and Technology
• SIGGRAPH—Special Interest Group on Graphics
• SIMD—Single Instruction, Multiple Data
• SIM—Subscriber Identity Module
• SIMM—Single Inline Memory Module
• SIP—Session Initiation Protocol
• SIP—Supplementary Ideographic Plane
• SISD—Single Instruction, Single Data
• SISO—Single-Input and Single-Output
• SLA—Service-level agreement
• SLAAC—Stateless address autoconfiguration
• SLE—Single-loss expectancy
• SLED—SUSE Linux Enterprise Desktop
• SLES—SUSE Linux Enterprise Server
• SLI—Scalable Link Interface
• SLIP—Serial Line Internet Protocol
• SLM—Service Level Management
• SLOC—Source Lines of Code
• SME—Subject Matter Expert
• SMF—Single-mode fiber
• SPM—Software project management
• SPMD—Single Program, Multiple Data
• SPOF—Single point of failure
• SMA—SubMiniature version A
• SMB—Server Message Block
• SMBIOS—System Management BIOS
• SMIL—Synchronized Multimedia Integration Language
• S/MIME—Secure/Multipurpose Internet Mail Extensions
• SMP—Supplementary Multilingual Plane
• SMP—Symmetric Multi-Processing
• SMPS—Switch Mode Power Supply
• SMS—Short Message Service
• SMS—System Management Server
• SMT—Simultaneous Multithreading
• SMTP—Simple Mail Transfer Protocol
• SMTPS—Simple Mail Transfer Protocol Secure
• SNA—Systems Network Architecture
• SNMP—Simple Network Management Protocol
• SNP—Secure Network Programming
• SNTP—Simple Network Time Protocol
• SOA—Service-Oriented Architecture
• SOAP—Simple Object Access Protocol
• SOAP—Symbolic Optimal Assembly Program
• SOAR—Security orchestration, automation and response
• SOC—Security operations center
• SOC—System and Organization Controls
• SoC—System on a chip
• SO-DIMM—Small Outline DIMM
• SOE—Standard Operating Environment
• SOHO—Small Office/Home Office
• SOI—Silicon On Insulator
• SOLID—Single-responsibility, Open-closed, Liskov substitution, Interface segregation, Dependency Inversion
• SOPA—Stop Online Piracy Act
• SOW—Statement of work
• SP—Service Pack
• SPA—Single Page Application
• SPF—Sender Policy Framework
• SPI—Serial Peripheral Interface
• SPI—Stateful Packet Inspection
• SPICE—Simple Protocol for Independent Computing Environments
• SPIM—Spam over instant messaging
• SPARC—Scalable Processor Architecture
• SPOF—Single point of failure
• SQL—Structured Query Language
• SQLi—SQL injection
• SRAM—Static Random-Access Memory
• SRP—Single-responsibility principle
• SRTP—Secure Real-time Transport Protocol
• SSA—Static Single Assignment
• SSADM—Structured systems analysis and design method
• SSD—Software Specification Document
• SSD—Solid-State Drive
• SSDP—Simple Service Discovery Protocol
• SSE—Streaming SIMD Extensions
• SSH—Secure Shell
• SSI—Server Side Includes
• SSI—Single-System Image
• SSI—Small-Scale Integration
• SSID—Service set identifier
• SSL—Secure Sockets Layer
• SSO—Single sign-on
• SSP—Supplementary Special-purpose Plane
• SSRF—Server-side request forgery
• SSSE—Supplementary Streaming SIMD Extensions
• SSSP—Single Source Shortest Path
• SSTC—Security Services Technical Committee
• SSTP—Secure Socket Tunneling Protocol
• STIX—Scientific and Technical Information eXchange
• STOMP—Simple (or Streaming) Text Oriented Messaging Protocol
• STP—Shielded twisted pair
• STP—Spanning Tree Protocol
• STUN—Session Traversal Utilities for NAT
• su—superuser
• SUS—Single UNIX Specification
• SUSE—Software und System-Entwicklung
• SVC—Scalable Video Coding
• SVC—Static VAR compensator
• SVD—Structured VLSI Design
• SVG—Scalable Vector Graphics
• SVGA—Super Video Graphics Array
• SVOT—Single version of the truth
• SWF—Shock Wave Flash
• SWG—Secure Web Gateway
• SWT—Standard Widget Toolkit
• Sysop—System operator

T

• TAO—Track-At-Once
• TACACS—Terminal Access Controller Access-Control System
• TAP—Test Access Port
• TAPI—Telephony Application Programming Interface
• TASM—Turbo ASseMbler
• TAXII—Trusted Automated eXchange of Indicator Information
• TB—TeraByte
• Tcl—Tool Command Language
• TCM—The Computer Museum
• TCP—Transmission Control Protocol
• TCP/IP—Transmission Control Protocol/Internet Protocol
• TCSEC—Trusted Computer System Evaluation Criteria
• TCU—Telecommunication Control Unit
• TDE—Transparent data encryption
• TDEA—Triple Data Encryption Algorithm
• TDES—Triple Data Encryption Standard
• TDMA—Time-Division Multiple Access
• TDP—Thermal Design Power
• TEAP—Tunnel Extensible Authentication Protocol
• TEE—Trusted execution environment
• TFT—Thin-Film Transistor
• TFTP—Trivial File Transfer Protocol
• TGS—Ticket Granting Service
• TGT—Ticket Granting Ticket
• THE—The Hessling Editor
• TI—Texas Instruments
• TIFF—Tagged Image File Format
• TIP—Threat Intelligence Platform
• TKIP—Temporal Key Integrity Protocol
• TLA—Three-Letter Acronym
• TLD—Top-Level Domain
• TLS—Thread-Local Storage
• TLS—Transport Layer Security
• TLV—Type—length—value
• TM—Translation memory
• TMM—Testing Maturity Model
• tmp—temporary
• TMS—Translation management system
• TNC—Terminal Node Controller
• TNC—Threaded Neill-Concelman connector
• TOCTOU, TOCTTOU or TOC/TOU—Time-of-check to time-of-use
• TOTP—Time-based one-time password
• TPF—Transaction Processing Facility
• TPM—Trusted Platform Module
• TROFF—Trace Off
• TRON—Trace On
• TRON—The Real-time Operating system Nucleus
• TRSDOS—Tandy Radio Shack – Disk Operating System
• TS—Timestamp
• TSIG—Transaction signature
• TSO—Time Sharing Option
• TSP—Traveling Salesman Problem
• TSR—Terminate and Stay Resident
• TTF—TrueType Font
• TTL—Transistor—Transistor Logic
• TTLS—Tunneled Transport Layer Security
• TTL—Time To Live
• TTP—Tesla Transport Protocol
• TTP—Time-Triggered Protocol
• TTP—Trusted third party
• TTS—Text-to-Speech
• TTY—Teletype
• TUCOWS—The Ultimate Collection of Winsock Software
• TUG—TeX Users Group
• TURN—-Traversal Using Relays around NAT
• Twinax—Twinaxial cabling
• TX-0—Transistorized eXperimental computer zero
• TWAIN—Technology Without An Interesting Name

U

• UAAG—User Agent Accessibility Guidelines
• UAC—User Account Control
• UART—Universal Asynchronous Receiver/Transmitter
• UAS—Unmanned aircraft system
• UAT—User Acceptance Testing
• UAV—Unmanned aerial vehicle
• UB—Undefined Behavior
• UBA—User behavior analytics
• UCS—Universal Character Set
• UDDI—Universal Description, Discovery, and Integration
• UDMA—Ultra DMA
• UDP—User Datagram Protocol
• UEBA—User and entity behavior analytics
• UEFI—Unified Extensible Firmware Interface
• UEM—Unified endpoint management
• UHF—Ultra High Frequency
• UI—User Interface
• UIMA—Unstructured Information Management Architecture
• UL—Upload
• ULA—Uncommitted Logic Array
• ULSI—Ultra Large Scale Integration
• UMA—Upper Memory Area
• UMB—Upper Memory Block
• UML—Unified Modeling Language
• UML—User-Mode Linux
• UMPC—Ultra-Mobile Personal Computer
• UMTS—Universal Mobile Telecommunications System
• UNC—Universal Naming Convention
• UNIVAC—Universal Automatic Computer (By MKS)
• UPS—Uninterruptible Power Supply or Uninterrupted Power Supply
• URI—Uniform Resource Identifier
• URL—Uniform Resource Locator
• URN—Uniform Resource Name
• USB—Universal Serial Bus
• US-CERT—United States Computer Emergency Readiness Team
• —User System Resources
• USR—U.S. Robotics
• UTC—Coordinated Universal Time
• UTF—Unicode Transformation Format
• UTM—Unified Threat Management
• UTP—Unshielded twisted pair
• UTRAN—Universal Terrestrial Radio Access Network
• UUCP—Unix to Unix Copy
• UUID—Universally Unique Identifier
• UVC—Universal Virtual Computer
• UWP—Universal Windows Platform
• UX—User Experience

V

• V2X—Vehicle-to-everything
• var—variable
• VaR—Value at risk
• VAX—Virtual Address eXtension
• VB—Visual Basic
• VBA—Visual Basic for Applications
• VBS—Visual Basic Script
• VCPI—Virtual Control Program Interface
• VDC—Virtual data center
• VDE—Virtual Desktop Environment
• VDI—Virtual Desktop Infrastructure
• VDM—Virtual DOS machine
• VDS—Virtual dedicated server
• VDSL—Very High Bitrate Digital Subscriber Line
• VDU—Visual Display Unit
• VDX—Virtual Desktop eXtender
• VEH—Vectored Exception Handling
• VESA—Video Electronics Standards Association
• VFAT—Virtual File Allocation Table
• VFO—Variable-frequency oscillator
• VFS—Virtual File System
• VHD—Virtual Hard Disk
• VG—Volume Group
• VGA—Video Graphics Array
• VHF—Very High Frequency
• VLAN—Virtual Local Area Network
• VLB—Vesa Local Bus
• VLF—Very Low Frequency
• VLIW—Very Long Instruction Word
• VLK—Volume Licensing Key
• VLSI—Very-Large-Scale Integration
• VLSM—Variable-length subnet masking
• VM—Virtual Machine
• VM—Virtual Memory
• VMM—Virtual Machine Monitor
• VNC—Virtual Network Computing
• VOD—Video On Demand
• VoIP—Voice over Internet Protocol
• VoLTE—Voice Over Long Term Evolution
• VPC—Virtual private cloud
• VPN—Virtual private network
• VPS—Virtual private server
• VPU—Visual Processing Unit
• VR—Virtual Reality
• VRAM—Video Random-Access Memory
• VRML—Virtual Reality Modeling Language
• VSAM—Virtual Storage-Access Method
• VSAT—Very Small Aperture Terminal
• VT—Video Terminal
• VTAM—Virtual Telecommunications Access Method
• VTL—Virtual tape library
• VUI—Voice user interface

W

• W3C—World Wide Web Consortium
• WAF—Web application firewall
• WAFS—Wide Area File Services
• WAI—Web Accessibility Initiative
• WAIS—Wide Area Information Server
• WAN—Wide Area Network
• WAP—Wireless Access Point
• WAP—Wireless Application Protocol
• WASM—Watcom ASseMbler
• WAVE—Wireless access in vehicular environments
• WBEM—Web-Based Enterprise Management
• WBS—Work breakdown structure
• WCAG—Web Content Accessibility Guidelines
• WCF—Windows Communication Foundation
• WDDM—Windows Display Driver Model
• WDM—Wavelength-Division Multiplexing
• WDM—Windows Driver Model
• WebDAV—WWW Distributed Authoring and Versioning
• WEP—Wired Equivalent Privacy
• WFI—Wait For Interrupt
• WIDE—Widely Integrated Distributed Environment
• WIDS—Wireless intrusion detection system

• WiMAX—Worldwide Interoperability for Microwave Access
• WIMG—Write-Through Access (W), Cache-Inhibited Access (I), Memory Coherence (M), and Guarded (G)
• WIMP—"windows, icons, menus, pointer"
• WinFS—Windows Future Storage
• WinRT—Windows RunTime
• WINS—Windows Internet Name Service
• WIPS—Wireless intrusion prevention system
• WLAN—Wireless Local Area Network
• WMA—Windows Media Audio
• WMI—Windows Management Instrumentation
• WMV—Windows Media Video
• WNS—Windows Push Notification Service
• WOL—Wake-on-LAN
• WOR—Wake-on-Ring
• WORA—Write once, run anywhere
• WORE—Write once, run everywhere
• WORM—Write Once Read Many
• WPA—Wi-Fi Protected Access
• WPAD—Web Proxy Autodiscovery Protocol
• WPAN—Wireless Personal Area Network
• WPF—Windows Presentation Foundation
• WPS—Wi-Fi Protected Setup
• WS—WebSocket
• WS-D—Web Services Dynamic Discovery
• WSDL—Web Services Description Language
• WSFL—Web Services Flow Language
• WSL—Windows Subsystem for Linux
• WTLS—Wireless Transport Layer Security
• WUSB—Wireless Universal Serial Bus
• WWAN—Wireless Wide Area Network
• WWDC—Apple World Wide Developer Conference
• WWID—World Wide Identifier
• WWN—World Wide Name
• WWW—World Wide Web
• WYSIWYG—What You See Is What You Get
• WZC—Wireless Zero Configuration

X

• XACML—eXtensible Access Control Markup Language
• XAML—eXtensible Application Markup Language
• XCBL—XML Common Business Library
• XCCDF—eXtensible Configuration Checklist Description Format
• XDM—X Window Display Manager
• XDMCP—X Display Manager Control Protocol
• XDR—eXtended detection and response
• XHTML—eXtensible Hypertext Markup Language
• XILP—X Interactive ListProc
• XML—eXtensible Markup Language
• XMMS—X Multimedia System
• XMPP—eXtensible Messaging and Presence Protocol
• XMS—eXtended Memory Specification
• XNS—Xerox Network Systems
• XP—Cross-Platform
• XP—eXtreme Programming
• XPCOM—Cross Platform Component Object Model
• XPI—XPInstall
• XPIDL—Cross-Platform IDL
• XPS—XML Paper Specification
• XSD—XML Schema Definition
• XSL—eXtensible Stylesheet Language
• XSL-FO—eXtensible Stylesheet Language Formatting Objects
• XSLT—eXtensible Stylesheet Language Transformations
• XSRF—Cross-site request forgery
• XSS—Cross-Site Scripting
• XT—Crosstalk
• XTACACS—eXtended Terminal Access Controller Access-Control System
• XTF—eXtensible Tag Framework
• XTF—eXtended Triton Format
• XUL—XML User Interface Language
• XVGA—eXtended Video Graphics Adapter

Y

• Y2K—Year Two Thousand
• Y2K38—Year Two Thousand Thirty Eight
• YACC—Yet Another Compiler Compiler
• YAGNI—You Aren't Gonna Need It
• YAML—YAML Ain't Markup Language
• YAML—Yet Another Multicolumn Layout
• YARN—Yet Another Resource Negotiator
• YaST—Yet another Setup Tool

Z

• ZCAV—Zone Constant Angular Velocity
• ZCS—Zero Code Suppression
• ZIF—Zero Insertion Force
• ZIFS—Zero Insertion Force Socket
• ZIP—ZIP file archive
• ZISC—Zero Instruction Set Computer
• ZOI—Zero One Infinity
• ZOPE—Z Object Publishing Environment
• ZMA—Zone Multicast Address
• ZPL—Z-level Programming Language

See also

• Acronym
• Internet slang
• List of file formats
• List of information technology initialisms

References

External links

• The UNIX Acronym List