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++, 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 OS X and iOS
• 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
• C:, or "Drive C", the default drive letter assignment for the default hard drive in MS-DOS, PC DOS, and Microsoft Windows

Technology

• C battery (size)
• 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 GHz to 6 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, 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 (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
• ¢, 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, 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
  • $C^0, C^1, C^2, \dots, C^\infty$, differentiability classes
• The combination or "choose" function, denoted
  $C(n,k)$, $C_k^n$, $^nC_k$, $_nC_k$, or ${n \choose k}$
• 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
• , symbol used to designate common time
• , symbol used to designate cut time
• Low C (song), a 2005 song by Supergrass
• "C" is a song by Francis Poulenc, one of Deux Poèmes de Louis Aragon.
• C Album, by Kinki Kids

Literature

• C, a 1924 novel by Maurice Baring
• C (novel), by Tom McCarthy shortlisted for the 2010 Man Booker Prize
• Middle C (novel), a 2013 novel by William H. Gass
• C California Style Magazine, magazine on California style, culture, etc.
• C-lehti, Finnish computer magazine
• C Magazine, published by 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 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

Other uses

• C (plastic toy), a plastic toy from former Czechoslovakia
• C (grade), a satisfactory grade in education
• U.S. stock symbol for Citigroup, Inc.
• [c], International Phonetic Alphabet symbol for the voiceless palatal stop
• С, a letter of the Cyrillic alphabet
• [C] (anime), by Tatsunoko Production, Fuji TV

See also

• Class C (disambiguation)
• C class (disambiguation)
• Sea (disambiguation)
• See (disambiguation)
• Cee (disambiguation)