C (disambiguation)

C is the third letter in the Latin alphabet

C may also refer to:

Computing

C (programming language), developed at Bell Labs in 1972
C++, an object oriented programming language based on C
Objective-C, an object oriented programming language based on C, while available on various platforms, used mainly on Mac OS X
C# (programming language), developed 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.
C:, or "Drive C", the default letter configuration for the default hard drive in MS-DOS, PC-DOS, and Microsoft Windows.

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
C, the standard abbreviation for an electronic capacitor, used e.g. in circuit diagrams

Vitamin C
Haplogroup C (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
Haplogroup C (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
ATC code C Cardiovascular system, a section of the Anatomical Therapeutic Chemical Classification System
Cervical vertebra 1 to Cervical vertebra 7
C, chemical symbol for the element 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
c, any constant in a mathematical equation
Cytosine, nucleic acid
C, capacitance
C, symbol of coulomb
Cysteine

A digit meaning twelve in hexadecimal and other positional numeral systems with a radix of 13 or greater
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
C, the set of continuous functions
- $C^0, C^1, C^2, \dots, C^\infty$ , differentiability classes
In probability theory, the combination or "choose" function, used to count the number of ways of selecting k unordered objects without replacement from a group of n. The combination function is commonly phrased as "choose n objects k at a time" or "n choose k", and uses the notations
$\mathbf{C}(n,k)$ , $\mathbf{C}_k^n$ , $^n\mathbf{C}_k$ , $\mathbf{_nC_k}$ , or ${n \choose k}$ .

C, alias for Mansfield Smith-Cumming (1859-1923), Chief of the SIS, the UK Secret Intelligence Service, also known as MI6
- His successors as Chief of the SIS have since been generally known by his alias, C.
C., Roman abbreviation for Gaius

Centre position in Australian rules football
In ice hockey, the captain is the player who wears a "C" on his jersey
In baseball, "C" is an abbreviation for catcher
Several sports have "C" as an abbreviation for center
In some sports, (C) after the name can designate either the captain or the coach