C4

C4, C04, C.IV, C-4, or C-04 may refer to:

People

• C4 (rapper), a rap music producer from Birmingham, England

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
• 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

Vehicles

Aircraft

• AEG C.IV, a German World War I reconnaissance aircraft
• AGO C.IV, a 1917 German reconnaissance aircraft
• Cierva C.4, a 1922 Spanish experimental autogyro
• 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
• Rumpler C.IV, a 1917 German single-engine, two-seater reconnaissance biplane
• 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

Locomotives

• Bavarian C IV, an 1884 German steam locomotive
• GS&WR Class C4, a Great Southern and Western Railway Irish steam locomotive

Motorised wheeled vehicles

• C4, a class of Audi 100 and Audi A6 cars
• Citroën C4, a car made by Citroën
• Coloni C4, a Formula One car built by Enzo Coloni Racing Car Systems
• Sauber C4, a Sauber sportscar
• Spyker C4, a Spyker car
• Chevrolet Corvette C4, the fourth production design of the Chevrolet Corvette

Ships

• HMS C4, a British C class submarine of the Royal Navy
• 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

Vehicle components

• Menasco C4, a 1930s 4-cylinder, air-cooled, in-line, inverted, aero-engine
• Ford C4 transmission, an automatic transmission

Roads

• Circumferential Road 4, a highway in the Philippines

Paper

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

Computing

• Cx4 chip, an add-on microprocessor chip for the Super Nintendo system (often incorrectly referred to as the C4 chip)
• Controlled collapse chip connection or flip chip, a method for interconnecting semiconductor devices
• 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

Music and television

• C4 (TV channel), a former New Zealand television music channel
• C₄, scientific pitch notation for the note "Middle C" (261.626 Hz)
• C4 Records, a record label
• C4 (band), a neo-classical metal band set up by Michael Angelo Batio
• C4 (Kendrick Lamar mixtape)

Sports

• C4 (classification), a Paralympic cycling classification
• 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)

Chess

• 1. c4, also called the English Opening, a chess opening

Railway stations

• Omotesandō Station, a Tokyo Metro subway station (station numbers C-04, G-02, H-02)

Other uses

• C4 (Colombia), a political party in Colombia
• C-4 (explosive), a type of plastic explosive
• C4, an abbreviation for Command, Control, Communications and Computers
• C4, 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
• C4, the fourth pure "core" module in the Edexcel A-level mathematics examination
• Caldwell 4 or NGC 7023 or Iris Nebula, a reflection nebula in the constellation Cepheus
• Cluster 4 or Tango, an ESA satellite to study the Earth's magnetosphere over the course of an entire solar cycle
• Hafdasa C-4, an Argentine submachine gun
• C4, a "501(c)(4) organization," i.e. one organized under section 501(c)(4) of the U.S. Internal Revenue Code
• C4, a challenge square dance program
• C4 Extreme, a sports nutrition supplement product line by Cellucor

See also

• CCCC (disambiguation)