C may also refer to:

Computing

• C (programming language), invented at Bell Labs in 1972
• C++, an object oriented programming language based on C
• C# (programming language), invented at Microsoft in 2001
• C (digit), a hexadecimal digit
• C (magazine), a defunct Finnish computer magazine
• Control-C, a keyboard control code
• C, a Computable function, the set of all computable decision problems.

Technology

• C battery (size)
• C battery (type), grid bias battery for vacuum tube radios
• Battery charging rate. Signifies a charge or discharge rate equal to the capacity of a battery divided by 1 hour. For example C for a 1600 mAh battery would be 1600 mA (or 1.6 amps). 2C is twice this rate and 1/2C is half the rate.
• C-clamp, a type of fastener
• C band, radio frequency band from 4 GHz to 6 GHz

Science

• Vitamin C
• Haplogroup C (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
• Haplogroup C (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
• C1 to C7, cervical vertebrae
• C, chemical symbol for carbon
• C, a prefix for astronomical objects listed in the Caldwell catalogue
• c, the speed of light in a vacuum
• c, the speed of sound
• c, the specific heat of a substance
• Cytosine, nucleic acid
• C, Capacitance

Transportation

• C (New York City Subway service)
• C (S-train), Copenhagen
• NZR C class (1873) train
• NZR C class (1930) train
• C, or 0-6-0 classification, a type of locomotive with three powered axles

Symbols

• ©, copyright
• ¢, cent

Mathematics

• C, the Constant of integration
• Ⅽ, in Roman numerals, the symbol for 100
• ℂ or $mathbb\{C\}$, the set of all complex numbers
• ℭ or $mathfrak\; c$, the cardinality of the continuum

Measurement

• c., or circa, an approximate date or other value
• °C, degrees Celsius
• C, for Carat (purity)
• c, Centi-, an SI prefix
• C, Coulomb, the SI derived unit for electric charge
• c, Cup (unit), a unit of volume

People

• C, alias for Mansfield Smith-Cumming (1859-1923), Chief of the SIS, the UK Secret Intelligence Service, also known as MI6

Other uses

• C (musical note)
• C (plastic toy), a plastic toy from former Czechoslovakia
• C (grade), a satisfactory grade in education
• Citigroup, Inc. Stock Symbol for Citigroup.
• Centre position in Australian rules football

See also

• Class C
• C class

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