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

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

* Cn (mathematics), C_n (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 *Short for "Citation needed (Wikipedia), Citation needed"