Cn
CN, Cn, cn and other variants may refer to:
Mathematics, science, and technology
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
- Cyanogen, a colorless, toxic gas with a pungent odor, (CN)2
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