C (disambiguation)

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, a hexadecimal digit
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 DOS and Windows

Carbon or C
Atomic carbon or C
ATC code C or cardiovascular system, a section of the Anatomical Therapeutic Chemical Classification System
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
Cytosine, nucleic acid
Cysteine
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
C, capacitance
C, symbol of coulomb
Charm quark (
c
)

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
The combination or "choose" function
c space, the space of all convergent sequences in functional analysis

C (novel), a novel by Tom McCarthy
C, a 1924 novel by Maurice Baring
C Magazine, a magazine published by Cardinal Courier Media
"C" Is for Corpse, the third novel in Sue Grafton's "Alphabet mystery" series, published in 1986
C-lehti ('C-magazine'), a defunct Finnish computer magazine

С, a letter of the Cyrillic alphabet
C (anime), by Tatsunoko Production, Fuji TV
C (grade), a satisfactory grade in education
C (plastic toy), a plastic toy from former Czechoslovakia
Citigroup, Inc.'s stock ticker symbol
Gaius or C
Center Party (Sweden), a Swedish political party
Mansfield Smith-Cumming or C (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 (IPA) in the International Phonetic Alphabet (IPA), the voiceless palatal stop
Dominical letter C for a common year starting on Friday
C, the production code for the 1964 Doctor Who serial The Edge of Destruction
Charlie, the military time zone code for UTC+03:00