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

Places

 * 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

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

 * Cn (mathematics), 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