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{{wiktionary|C|c}}
'''[[C]]''' is the third letter in the Latin alphabet.

'''C''' may also refer to:

{{TOC right}}
==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 Mac OS X and iOS.
* [[C Sharp (programming language)|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.
* <code>C:</code>, or "Drive C", the default [[drive letter assignment]] for the default hard drive in MS-DOS, PC&nbsp;DOS, and Microsoft Windows.

==Technology==
* [[C battery]] (size)
* [[Battery (vacuum tube)#C battery|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]], radio frequency band from 4&nbsp;GHz to 6&nbsp;GHz
* C, the standard abbreviation for an electronic [[capacitor]], used e.g. in circuit diagrams

==Science==
* [[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]]
* ''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]]

==Transportation==
*[[Line C (disambiguation)]] used in several public transport systems
*[[NZR C class (1873)]] train
*[[NZR C class (1930)]] train
* C, or [[0-6-0]] classification, a type of locomotive with three powered axles

==Symbols==
* [[Copyright symbol|©]], copyright
* [[Cent (currency)#Symbol|¢]], cent

==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 or <math>\mathbb{C}</math>, the set of all [[complex number]]s
* ℭ or <math>\mathfrak c</math>, the [[cardinality of the continuum]]
* ''C'', the set of [[continuous function]]s
** <math>C^0, C^1, C^2, \dots, C^\infty</math>, [[differentiability class]]es
* In probability theory, the [[combination]] or "choose" function, uses the notations <br/><math>C(n,k)</math>, <math>C_k^n</math>, <math>^nC_k</math>, <math>_nC_k</math>, or <math>{n \choose k}</math>.
* [[c space|''c'' space]], the space of all convergent sequences in functional analysis

==Measurement==
* c., or [[circa]], an approximate date or other value
* °C, degrees [[Celsius]]
* C, for [[carat (purity)]]
* c, [[centi-]], an SI prefix
* C, [[coulomb]], the SI derived unit for electric charge
* c, [[cup (unit)]], a unit of volume

==Music==
* [[C (musical note)]], and keys based on it:
** [[C major]]
** [[C minor]]
** [[C-sharp major]]
** [[C-sharp minor]]
* {{music|common-time}}, symbol used to designate [[common time]]
* {{music|cut-time}}, symbol used to designate [[cut time]]
* [[Low C (song)]], a 2005 song by Supergrass
* "C" is a chanson by [[List of compositions by Francis Poulenc#Vocal|Francis Poulenc]], one of ''Deux Poèmes de Louis Aragon.

==Literature==
<!-- C (magazine) redirects here -->
* ''C'', a 1924 novel by [[Maurice Baring]]
* ''C'', a novel by [[Tom McCarthy (writer)|Tom McCarthy]] shortlisted for the 2010 Man Booker Prize<!--should be linked to section, but section should be separate article-->
* [[Middle C (novel)|''Middle C'' (novel)]], a 2013 novel by William H. Gass
* [[C California Style Magazine|''C'' California Style Magazine]], magazine on California style, culture, etc.
* ''[[C-lehti]]'', Finnish computer magazine
* ''C Magazine'', published by [[Cardinal Courier Media#C Magazine|Cardinal Courier Media]] in New York

==People==
* C, alias for [[Mansfield Smith-Cumming]] (1859–1923), Chief of the SIS, the UK Secret Intelligence Service, also known as MI6
** His successors as [[Secret Intelligence Service#Chiefs of the SIS|Chief of the SIS]] have since been generally known by his alias, C.
* C., Roman abbreviation for [[Gaius]]

==Sport==
* [[Captain (ice hockey)]], the player who wears a "C" on his jersey
* [[Catcher]], in baseball
* Several sports have "C" as an abbreviation for [[Center (disambiguation)#Sports|center]]

==Other uses==
* [[C (plastic toy)]], a plastic toy from former Czechoslovakia
* [[C (grade)]], a satisfactory grade in education
* [[Citigroup, Inc.]] Stock Symbol for Citigroup
* C, the NYSE ticker for [[Grupo Financiero Banamex]]
* [c], International Phonetic Alphabet symbol for the [[voiceless palatal stop]]
* [[C (anime)|''[C]'' (anime)]], by Tatsunoko Production, Fuji TV

==See also==
* [[Class C (disambiguation)]]
* [[C class (disambiguation)]]
* [[Sea (disambiguation)]]
* [[See (disambiguation)]]
* [[Cee (disambiguation)]]
* {{lookfrom|C}}
* {{intitle|C}}

{{disambiguation}}