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

Companies

Canadian National Railway The Canadian National Railway Company () is a Canadian Class I freight railway headquartered in Montreal, Quebec, which serves Canada and the Midwestern and Southern United States. CN is Canada's largest railway, in terms of both revenue a ...

, 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 Cartoon Network (CN) is an American cable television television channel, channel and the flagship property of the Cartoon Network, Inc., a sub-division of the Warner Bros. Discovery Networks division of Warner Bros. Discovery. It launched on ...

, an American cable channel ** List of international Cartoon Network channels

Places

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

(People's Republic of China), ISO 3166 country code CN * CN Centre, an arena in Prince George, British Columbia *

CN Tower The CN Tower () is a communications and observation tower in Toronto, Ontario, Canada. Completed in 1976, it is located in downtown Toronto, built on the former Railway Lands. Its name "CN" referred to Canadian National, the railway co ...

, 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 nerve Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), of which there are conventionally considered twelve pairs. Cranial nerves relay information between the brain and parts of the body, primarily to and f ...

s, CN 0 to CN XII

Chemistry

* CN gas, a substituted acetophenone used as a riot control agent *

Copernicium Copernicium is a synthetic chemical element; it has symbol Cn and atomic number 112. Its known isotopes are extremely radioactive, and have only been created in a laboratory. The most stable known isotope, copernicium-285, has a half-life of ap ...

, symbol Cn, a chemical element *

Cyanide In chemistry, cyanide () is an inorganic chemical compound that contains a functional group. This group, known as the cyano group, consists of a carbon atom triple-bonded to a nitrogen atom. Ionic cyanides contain the cyanide anion . This a ...

, any chemical compound that contains a carbon atom triple-bonded to a nitrogen atom, -CN ** Cyano radical, molecular formula ·CN *

Cyanogen Cyanogen is the chemical compound with the chemical formula, formula . Its structure is . The simplest stable carbon nitride, it is a Transparency and translucency, colorless and highly toxic gas with a pungency, pungent odor. The molecule is a ...

, 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 The Lightweight Directory Access Protocol (LDAP ) is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. Directory serv ...

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 In abstract algebra, a cyclic group or monogenous group is a Group (mathematics), group, denoted C_n (also frequently \Z_n or Z_n, not to be confused with the commutative ring of P-adic number, -adic numbers), that is Generating set of a group, ge ...

* C_n, a classical

root system In mathematics, a root system is a configuration of vector space, vectors in a Euclidean space satisfying certain geometrical properties. The concept is fundamental in the theory of Lie groups and Lie algebras, especially the classification and ...

* cn (elliptic function), one of Jacobi's elliptic functions

Other uses in mathematics, science, and technology

Carrier-to-noise ratio In telecommunications, the carrier-to-noise ratio, often written CNR or ''C/N'', is the signal-to-noise ratio (SNR) of a modulated signal. The term is used to distinguish the CNR of the radio frequency passband signal from the SNR of an analog ...

''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 County Cavan ( ; ) is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Ulster and is part of the Northern and Western Region. It is named after the town of Cavan and is based on the hi ...

, Ireland * Vehicle registration code for

Province of Cuneo The province of Cuneo (; ) is a province in the Piedmont region of Italy. To the west, it borders the French region of Provence-Alpes-Côte d'Azur ( departments of Alpes-Maritimes, Alpes-de-Haute-Provence and Hautes-Alpes), to the north the ...

, Italy * Aircraft registration code for

Morocco Morocco, officially the Kingdom of Morocco, is a country in the Maghreb region of North Africa. It has coastlines on the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to Algeria–Morocc ...

* Group CN, a category of prototype racing cars