CN

CN or cn may stand for: Places People's Republic of China, ISO 3166-1 alpha-2 country codeComoros, FIPS Pub 10-4 and obsolete NATO digramCN Tower, TorontoCN Centre - an arena in Prince George, British ColumbiaProvince of Cuneo (Italy)
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.cn is the country code top-level domain (ccTLD) for the People's Republic of China.The domain name administration in China is done through a branch of the Ministry of Information Industry. This ministry oversees everything from telecommunications to broadcasting similar to the Federal Communications Commission in the United States. The registry is maintained by China Internet Network Information Center (CNNIC). The actual registrations are done through commercial registrars similar to other parts of the world.  Neulevel has entered into a partnership with CNNIC to market .cn outside China.
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The Canadian National Railway (CN; AAR reporting marks CN, CNA, CNIS) is a Canadian Class I railway operated by the Canadian National Railway Company headquartered in Montréal, Québec.CN is the largest railway in Canada, in terms of both revenue and the physical size of its rail network and is currently Canada's only transcontinental railway company, spanning Canada from the Atlantic coast in Nova Scotia to the Pacific coast in British Columbia. It also has extensive trackage in the central United States along the Mississippi River valley from the Great Lakes to the Gulf of Mexico.
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[Image:Cyanide-montage.png|thumb|right|150px|The cyanide ion, CN−. From the top: 1. Valence-bond structure 2. Space-filling model 3. Electrostatic potential surface 4. 'Carbon lone pair' HOMO]] A cyanide is any chemical compound that contains the cyano group (C≡N), which consists of a carbon atom triple-bonded to a nitrogen atom. Cyanide specifically is the anion CN-. Many organic compounds feature cyanide as a functional group; these are called nitriles in IUPAC nomenclature (for example, CH3CN is referred to by the names acetonitrile or ethanenitrile per IUPAC, but occasionally it is labeled using the common name methyl cyanide). Of the many kinds of cyanide compounds, some are gases, others are solids or liquids. Some are molecular, some ionic, and many are polymeric. Those that can release the cyanide ion CN- are highly toxic.
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National Highway

<networking> The country code for China.
(1999-01-27)

abb. N M
Gnaeus (Roman praenomen); (abb. Cn.)

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