S is the nineteenth letter of the English alphabet.
S may also refer to:
History
Language and linguistics
Transportation
- S (New York City Subway service), one of the three services:
- Franklin Avenue Shuttle
- 42nd Street Shuttle (also called the Grand Central/Times Square Shuttle) (internally referred to as the 0)
- Rockaway Park Shuttle (also called Rockaway Shuttle) (internally referred to as the H)
- Toei Shinjuku Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled
- Sennichimae Line, a subway service operated by the Osaka Metro, labeled
- , the official West Japan Railway Company service symbol for the Kansai Airport Line
- Shrirangapattana railway station (Indian Railways station code: S), Karnataka, India
- Karjat railway station (Mumbai Suburban Railway station code: S), Maharastra, India
- Bojonegoro, Mojokerto, Tuban, Lamongan and Jombang (vehicle registration prefix S)
Mathematics and logic
Physics and chemistry
- Sulfur, symbol S, a chemical element
- s, for second, the SI unit of time
- S, the symbol for entropy
- S, a non-SI unit used to designate molecule size named after the Svedberg sedimentation coefficient
- (S), a label that denotes one of two chiral center configurations in the R/S system
- s, one of the Mandelstam variables, the square of the invariant mass
- Siemens (unit), the SI derived unit of electric conductance
- S-block of the periodic table, which includes alkali metals, alkaline earth metals, and hydrogen and helium
- Spin (physics)
- s, an abbreviation for solid
- S-matrix for how a particle physics system works under a scattering process. This is a distinct concept from scattering parameters, below, which may also be referred to as an S-matrix in the context of radio frequency transmissions.
Biology and medicine
- Serine, a standard amino acid abbreviated as Ser or S
- ATC code S Sensory organs, a section of the Anatomical Therapeutic Chemical Classification System
- S phase or synthesis phase, a period in the cell cycle during interphase
Computing
- Samsung Galaxy S (2010 smartphone), the first flagship smartphone of the Samsung Galaxy S series
- S (programming language), an environment for statistical computing and graphics
- <s>, the opening tag for the HTML element denoting information that is "no longer accurate or no longer relevant", usually rendered as <s>strike-through text</s>
- S record or SREC, a file format with an ASCII representation of Binary data
People
Arts and entertainment
Books
Music
- S, the stage name of singer-songwriter and guitarist Jenn Champion
- S (group), a short-lived South Korean music group active in 2003 and 2014
- S, a 2001 EP by Japanese musical duo NaNa
- S (EP), a 2013 EP by American singer SZA
- Numbering of Franz Liszt's works according to Humphrey Searle's catalogue
- "S" (song), by Japanese band Sid
Television
Comics
Automobiles
Production models
Prototypes and concepts
Series and trims
- Acura Type-S, a range of Japanese performance vehicles
- Audi S, a range of German performance vehicles
- Honda S series, series of Japanese sports cars
- Jaguar S, a range of British performance vehicles
- Saviem S, a range of French medium-duty cab-over trucks
Other uses
- S by Shakira, the first woman's fragrance by Colombian singer songwriter Shakira
- Safety (gridiron football position)
- South on a map or compass, one of the four cardinal directions
- s, the SI symbol for second
- Shilling (British coin)
- Scattering parameters as S-matrix or S-parameters for how an electrical network behaves at some frequency, used e.g. with radio transmission
- Old Israeli Shekel, denominated as S
- S postcode area, a postcode area including Sheffield, England
- A party label for the Swedish Social Democratic Party
- Strike (baseball)
- S band, a band of radio which ranges from 2 to 4 GHz
- Sierra, the military time zone code for UTCâÂÂ06:00
- Cool S, a graffiti sign
- Nikon S-mount, type of interchangeable lens mount used by a series of Nikon 35 mm rangefinder cameras
See also