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

Troponin C, one of the three troponins
Carbon, symbol C, a chemical element
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
C (or Cys), an abbreviation for the amino 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 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-value, DNA contained within a haploid nucleus

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

NZR C class (1873) train
NZR C class (1930) train
C, or 0-6-0 classification, a type of locomotive with three powered axles
C, the unofficial designation used by the U.S. Navy classification for Protected Cruisers and Peace Cruisers before the 1920 reclassification.
C (Los Angeles Railway)
C (S-train) a service on the S-train network in Copenhagen
C (New York City Subway service)
C Line (Los Angeles Metro)
Line C of the Buenos Aires Subte
Tokyo Metro Chiyoda Line, a subway service operated by the Tokyo Metro, labeled
Chūō Line, a subway service operated by the Osaka Metro, labeled
RER C, a line in the RER of Paris
The official West Japan Railway Company service symbol for:
- Kusatsu Line.
- Sakai Line.

Prefix "c", to specify a column number as in-source-locator in old citations
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, also known as Max Denbigh, a character played by Andrew Scott in the film Spectre
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
c, alternative name for Grimes
Farmall C, a tractor produced by International Harvester from 1948 to 1951
C (restaurant), a restaurant in Tampere, Finland