C4

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

• C-4 (explosive), a type of plastic explosive
• Hafdasa C-4, an Argentine submachine gun

In biology:

• C4 carbon fixation, a pathway for carbon fixation in photosynthesis
• ATC code C04 Peripheral vasodilators, a subgroup 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, a nerve originating in the neck
• Apolipoprotein C4, a human gene
• Complement component 4, a protein
• C04, Oral cancer ICD-10 code

In vehicles:

• C4, a class of Audi 100 and Audi A6 cars
• 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
• Cierva C.4, a 1922 Spanish experimental autogyro
• Citroën C4, a car made by Citroën
• DFW C.IV, a 1916 German reconnaissance aircraft
• Flight Design C4, a four-seat light aircraft
• Fokker C.IV, a 1923 Dutch two-seat reconnaissance aircraft
• 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
• Circumferential Road 4, a highway in the Philippines
• Sauber C4, a Sauber sportscar
• Spyker C4, a Spyker car
• C-4 Argonaut, a Canadair aircraft derived from the Douglas DC-4
• C-4, the US Army designation of the Ford Trimotor
• C-4 Academe, the military version of Gulfstream I twin turboprop business aircraft
• Chevrolet Corvette C4, the fourth production design of the Chevrolet Corvette
• Ford C4 transmission, an automatic transmission
• Saturn C-4, a 1960 conceptual American launch vehicle
• 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
• Type C4 ship, merchant cargo ships of United States Maritime Commission "C" design

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
• Suneido programming language is the successor language to the C4 programming language from Axon Development Corporation
• Chaos Computer Club Cologne (Köln), also see Chaos Computer Club

In music and television:

• Tha Carter IV, studio album by Americal rapper Lil Wayne
• Channel 4, a United Kingdom television broadcaster
• C4 (TV channel), a New Zealand television music channel
• Middle C in music (American notation)
• C4 Records, a record label
• C4 (band), a neo-classical metal band set up by Michael Angelo Batio
• C4, The start note of the 5th octave, on a piano or music keyboard. Most important for music sequencers as base note start.

In sports

• C4, an abbreviation for a four-man Sprint Canoe, see Canoe racing
• C4, a term used to refer to the UEFA Intertoto Cup, a football 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 (Colombia), a political party in Colombia
• C4, an acronym for Command, Control, Communications and Computers
• 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
• 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
• The fourth pure "core" module in the Edexcel A-level mathematics examination.
• Caldwell 4 (the Iris Nebula, NGC 7023), a reflection nebula in Cepheus
• Cluster 4, also known as Tango, an ESA satellite

See also

• CCCC (disambiguation)