C (disambiguation)

Look up C, c, or Appendix:Variations of "c" in Wiktionary, the free dictionary.

C is the third letter in the Latin alphabet.

C or 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 OS X and iOS
C# (programming language), developed at Microsoft in 2001
C, a Hexadecimal digit
Control-C, a keyboard control code
C, a computable function, the set of all computable decision problems
C:, or "Drive C", the default drive letter assignment 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
A battery charger rate 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 (disambiguation)
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-M130 (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup once called simply C
ATC code C Cardiovascular system, a section of the Anatomical Therapeutic Chemical Classification System
C1 to C7, symbols for cervical vertebrae
C, chemical symbol for the element carbon
C, chemical formula for atomic carbon
C, a prefix for astronomical objects listed in the Caldwell catalogue, ranging from C1 to C109
C, a prefix for astronomical star clusters, which follow the IAU's "Chhmm±ddd" format
c, the speed of light in a vacuum
c, the speed of sound
c, the specific heat capacity of a substance
c, any constant (mathematics)
Cytosine, nucleic acid
C, capacitance
C, symbol of coulomb
Cysteine

C, 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, 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
The combination or "choose" function, denoted
$C(n,k)$ , $C_k^n$ , $^nC_k$ , $_nC_k$ , or ${n \choose k}$
c space, the space of all convergent sequences in functional analysis

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