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==Mathematics, science, and technology== ===Biology=== * [[Computational neuroethology]], the study of animal behavior and its control by the nervous system * [[Cranial nerve]]s, 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 Β·CN * [[Cyanogen]], a colorless, toxic gas with a pungent odor, (CN)<sub>2</sub> ===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<sub>n</sub>, a [[cyclic group]] * C<sub>n</sub>, a classical [[Root system#Cn|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
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