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
 * , or "Drive C", the default drive letter assignment for the default hard drive in DOS and Windows

Measurement

 * &deg;C, Celsius temperature scale
 * Carat (purity)
 * centi-, an SI prefix
 * Coulomb, the SI derived unit for electric charge
 * Cup (unit), a unit of volume

Science

 * 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-value, DNA contained within a haploid nucleus

Technology

 * C battery, a size of battery
 * Capacitor or C
 * C battery, a type of battery for vacuum tube radios
 * C or C-rate, a rate of charge and discharge of a battery

Mathematics

 * 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

Music

 * C (musical note), and keys based on it:
 * C major
 * C minor
 * C Album, an album by Kinki Kids
 * C major chord, a chord in popular music
 * , symbol used to designate common time
 * , symbol used to designate alla breve
 * "C", a composition by Francis Poulenc, one of Deux Poèmes de Louis Aragon

Literature

 * 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

Transportation

 * Mercedes-Benz C-class
 * 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 Logo of Tokyo Metro Chiyoda Line.svg
 * Chūō Line, a subway service operated by the Osaka Metro, labeled Osaka Metro Chuo line symbol.svg
 * RER C, a line in the RER of Paris
 * The official West Japan Railway Company service symbol for:
 * JRW kinki-C.svg Kusatsu Line.
 * JRW san-C.svg Sakai Line.

Sport

 * Captain (ice hockey)
 * Catcher, a position in baseball
 * Center (basketball)
 * Center (gridiron football)

Other uses

 * 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