CN

CN, Cn, cn and other variants may refer to:

Companies

• Canadian National Railway, reporting mark CN
• China Netcom, a former telecommunication service provider in China, NYSE symbol
• Collegiate Network, supporting college publications
• Grand China Air, IATA code CN
• Islands Nationair, an airline based in Port Moresby, Papua New Guinea, IATA code CN
• Westward Airways (Nebraska), a former airline, IATA code CN (dissolved 2005)

Media and entertainment

• Cartoon Network, an American cable channel
• List of international Cartoon Network channels
• The Cartoon Network, Inc., an American entertainment company which operates the channel
• CN23 (Cultura y Noticias 23), a defunct Argentine news channel

Places

• Canada, which has ISO 3166 country code "CA" but is sometimes abbreviated "CN" by American organizations to disambiguate from California
• China (People's Republic of China), ISO 3166 country code CN
• CN Centre, an arena in Prince George, British Columbia
• CN Tower, communications and observation tower in Toronto, Ontario
• Station code for Cirebon railway station
• Circuito Norte, national highway of Cuba

Mathematics, science, and technology

Biology

• Computational neuroethology, the study of animal behavior and its control by the nervous system
• Cranial nerves, CN 0 to CN XII

Chemistry

• CN gas, a substituted acetophenone used as a riot control agent
• Copernicium, symbol Cn, a chemical element
• Cyanide, any chemical compound that contains a carbon atom triple-bonded to a nitrogen atom, -CN
• Cyano radical, molecular formula ·CN
• Cyanogen, a colorless, toxic gas with a pungent odor, (CN)₂

Computing

• .cn, country code top-level domain for mainland China
• Cloud native computing, an approach in software development
• Common Name, an attribute of the Lightweight Directory Access Protocol protocol family
• Common Name, an attribute of X.509 public-key certificates
• VIA CN, a 64-bit CPU for personal computers

Mathematics

• C_n, a cyclic group
• C_n, a classical root system
• cn (elliptic function), one of Jacobi's elliptic functions

Other uses in mathematics, science, and technology

• Carrier-to-noise ratio C/N, the signal-to-noise ratio of a modulated signal
• Curve number, a parameter used in hydrology for predicting direct runoff or infiltration from rainfall
• cN, abbreviation for centinewton, a force equal to one hundredth of a newton
• Classical nova, a type of cataclysmic variable star

Other uses

• Cn (digraph), a digraph used in English for a few words of Greek origin
• Cnaeus (disambiguation) or Gnaeus (disambiguation), popular Roman praenomens
• Combined Nomenclature, EU customs coding
• Vehicle registration code for County Cavan, Ireland
• Vehicle registration code for Province of Cuneo, Italy
• Aircraft registration code for Morocco
• Group CN, a category of prototype racing cars
• Citation needed, a template on Wikipedia

See also

• CNN, an American basic cable and satellite television channel