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C4, C04, C.IV or C-4 may refer to:

• C4 (Colombia), a political party in Colombia
• C-4 (explosive), a type of plastic explosive

In biology:

• C4 carbon fixation, a pathway for carbon fixation in photosynthesis
• ATC code C04, section of the Anatomical Therapeutic Chemical Classification System
• In human anatomy, C4 may refer to:

• Cervical vertebra 4, one of the cervical vertebrae of the vertebral column
• Cervical spinal nerve 4

• Apolipoprotein C4, a human gene
• Complement component 4, a protein
• C04, Malignant neoplasm of floor of mouth ICD-10 code

In vehicles:

• C-4, the US Army designation of the Ford Trimotor
• a class of Audi 100 and Audi A6
• C-4 Academe, the military version of Gulfstream I twin turboprop business aircraft
• AEG C.IV, a German World War I reconnaissance aircraft
• AGO C.IV, a 1917 German reconnaissance aircraft
• Bavarian C IV, a 1884 German steam locomotive
• Chevrolet Corvette C4, the fourth production design of the Chevrolet Corvette
• Cierva C.4, a 1922 Spanish experimental autogyro
• Citroën C4, a car made by Citroën
• DFW C.IV, a 1916 German reconnaissance aircraft
• Fokker C.IV, a 1923 Dutch two-seat reconnaissance aircraft
• Ford C4 transmission, an automatic transmission
• GS&WR Class C4, a Great Southern and Western Railway Irish steam locomotive
• HMS C4, a British C class submarine of the Royal Navy
• Menasco C4, a 1930s 4-cylinder, air-cooled, in-line, inverted, aero-engine
• Rumpler C.IV, a 1917 German single-engine, two-seater reconnaissance biplane
• Saturn C-4, a 1960 conceptual American launch vehicle
• Sauber C4, a Sauber sport car
• Spyker C4, a Spyker car
• USS C-4 (SS-15), a United States C class submarine of the United States Navy
• USS Philadelphia (C-4), a protected cruiser of the United States Navy
• Canadair North Star C-4 aircraft derived from the Douglas DC-4

In paper:

• C4, an international standard paper size (229*324 mm), defined in ISO 216
• C4, the envelope size matching the A4 paper size

In computing:

• Cx4 chip, an add-on microprocessor chip for the Super Nintendo system (often incorrectly referred to as the C4 chip)
• Flip chip packaging is also called Controlled Collapse Chip Connection, or C4
• VIA C4, a planned design of central processing unit for a personal computer
• C4 (conference), a Macintosh software developers conference
• C4 Engine, a next-generation 3D game engine
• CodeWeavers CrossOver Compatibility Center
• Suneido programming language is the successor language to the C4 programming language from Axon Development Corporation

In music and television:

• Channel 4, a United Kingdom television broadcaster
• C4 (TV channel), a New Zealand television music channel
• Middle C in music (American notation)
• c4 - Musical note, C above high C - European notation
• C4 Records, a record label
• C4 (band), a neo-classical metal band set up by Michael Angelo Batio

In sports

• C4, an abbreviation for a four-man Sprint Canoe
• C4, a term used to refer to the UEFA Intertoto Cup, a football competition, so named because it was (until 1999) the fourth most prestigious UEFA competition. Mainly used in non-English speaking countries

In chess

• 1. c4, also called the English Opening, is the fourth most popular chess opening.

Other:

• C4, an acronym for Command, Control, Communications, and Computers, used by the US Department of Defense
• C4 (heraldry), the monogram of Christian IV of Denmark, used in the city arms of Kristianstad, Sweden since 1622
• C-4, professional wrestler Paul Burchill's name for his finishing move, a moonsault uranage
• C4 (Belgium), form from the employer entitling an employee to claim unemployment benefits at the end of employment
• Churches Covered and Connected in Covenant, a Religious Association founded by Archbishop LeRoy Bailey Jr.
• butyl-type hydrocarbon chain with 4 carbon atoms, especially in C4 reversed-phase chromatography columns

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• This page was last modified on 28 December 2008, at 21:56.

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