C (disambiguation)

C is the third letter in the Latin alphabet.

C or c may also refer to:

STEM

Technology

Computing

• C (programming language), developed at Bell Labs in 1972
• C, the digit with value 12 (number) in hexadecimal
• C:, or "Drive C", the default drive letter assignment for the default hard drive in DOS and Windows

Electronics

• C battery, a size of battery
• "C" battery, vacuum tube battery used to provide bias to the control grid
• Battery charger § C-rate
• Capacitor or C

Measurement

• °C, Celsius temperature scale
• c, carat (purity)
• c, centi-, an SI prefix
• C, Coulomb, the SI derived unit for electric charge

Science

• c (IPA), the notation for the voiceless palatal stop in the International Phonetic Alphabet

Medicine

• 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
• C-value, DNA contained within a haploid nucleus

Biochemistry

• Troponin C, one of the three troponins
• Cytosine, nucleic acid
• C (or Cys), an abbreviation for the amino acid cysteine

Materials science

• Carbon, symbol C, a chemical element
  • Atomic carbon, chemical formula C
• c, the specific heat capacity of a substance
• C, capacitance

Physics

• c, charm quark
• c, the speed of sound
• c, the speed of light in vacuum

Astronomy

• C, a prefix for astronomical star clusters, which follow the IAU's "Chhmm±ddd" format
• C, a prefix for astronomical objects listed in the Caldwell catalogue, ranging from C1 to C109

Mathematics

• c, any constant
• C, the constant of integration
• C, the digit meaning 12 (number) in positional numeral systems with a radix of 13 or greater
• 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, the combination or "choose" function
• c space, the space of all convergent sequences in functional analysis

Arts and media

• C (TV series), Control: The Money and Soul of Possibility, an anime show created by Tatsunoko Production, broadcast on Fuji TV in 2011
• C (plastic toy), Czech: céčko (plural: céčka), from Czechoslovakia, initially used as buckles and in door hangings
• C, the production code of The Edge of Destruction (AKA Inside the Spaceship), the third Doctor Who serial, broadcast 1964
• C, pseudonym for the character Max Denbigh in the 2015 film Spectre

Music

• C (musical note), and keys based on it:
  • C major
  • C minor
• C Album, 1999 album by Kinki Kids
• C (Miho Nakayama album), stylized as 「C」, 1985
• "C" (song), stylized as "「C」", 1985 single by Miho Nakayama
• C (Lucy Bedroque album), 2026
• , symbol used to designate common time
• , symbol used to designate alla breve
• "C", one of Deux Poèmes de Louis Aragon by Francis Poulenc
• "C" (Deltarune), a 2025 track by Toby Fox from Deltarune Chapters 3+4 OST from the video game Deltarune
• c, alternative name for Grimes

Literature

• Prefix "c", to specify a column number as in-source-locator in old citations
• 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
• Codex Ephraemi Rescriptus
• C (journal), a natural sciences academic periodical published by MDPI

Transportation

• Line C (disambiguation) including "C line"; used in several public transport systems
• Mercedes-Benz C-class
• C, the unofficial designation used by the U.S. Navy classification for Protected Cruisers and Peace Cruisers before the 1920 reclassification
• Farmall C, a tractor produced by International Harvester from 1948 to 1951

Rail

C Train (disambiguation)

• 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 (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 (Buenos Aires Underground)
• Tokyo Metro Chiyoda Line, a subway service operated by the Tokyo Metro, labeled
• Chūō Line (Osaka), 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

Sport

• Captain (ice hockey)
• Catcher, a position in baseball
• Center (disambiguation) § Sports

Military units

• C (Glamorgan Yeomanry) Troop
• C (Kent and Sharpshooters Yeomanry) Squadron
• C (Rhodesia) Squadron 22 SAS

Other uses

• C (grade), a satisfactory grade in education
• Citigroup, Inc.'s stock ticker symbol
• Caius, a Latin name
• 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
• Dominical letter C for a common year starting on Friday
• Charlie, the military time zone code for UTC+03:00
• C (restaurant), a restaurant in Tampere, Finland

See also

• All pages with titles beginning with C
• All pages with titles containing C

Identically-pronounced words

• Cee (disambiguation)
• Sea (disambiguation)
• See (disambiguation)
• Si (disambiguation)

Similar-looking characters, variants, and with punctuation

• С/с, the letter "es" in the Cyrillic alphabet
• Ϲ, the lunate form of the letter "sigma" in the Greek alphabet
• ⊂, the relation symbol indicating that a set is a subset of another set
• ¢, cents
• C. (disambiguation)
• (C) (disambiguation)
• Ⓒ/ⓒ, circle-c (disambiguation)
• ©, copyright symbol (disambiguation)
• C+ (disambiguation)
• C♯ (disambiguation)

With a number or word added

• C0–C3 (or higher), collectively C-states, the CPU (processor) power states
• C1–C7, the cervical vertebrae
• C-Note (disambiguation)
• C band (disambiguation)
• C-clamp, a type of fastener
• C class (disambiguation)
• Class C (disambiguation)
• C group (disambiguation)
• Group C (disambiguation)
• C series (disambiguation) including "Series C"
• C-size (disambiguation)
• Control-C, a keyboard control code
• C unit (disambiguation)
• Vitamin C