Abbreviation for the following:
(biochemistry) Cytosine, i.e. a pyrimidine nucleobase in DNA and RNA, pairs with guanine
(biochemistry) Carbon, i.e. an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond
(biochemistry) Cysteine, a type of amino acid
(physics) Coulomb, i.e. a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second
Celsius, i.e. a degree on the centigrade scale of temperature
(physics) The speed at which light travels in a vacuum; the constancy and universality of the speed Of Light is recognized by defining it to be exactly 299,792,458 meters per second.