C4 or C-4 may refer to:

• C-4 (explosive), a type of plastic explosive

In biology: Preparing C-4 explosive C-4 or Composition C-4 is a common variety of military plastic explosive. ...

• C4 carbon fixation, a pathway for carbon fixation in photosynthesis
• Fourth cervical vertebra or C4 spinal nerve, in human anatomy
• Complement component 4

In vehicles: Overview of C4 carbon fixation C4 carbon fixation is one of three methods, along with C3 and CAM photosynthesis, used by land plants to fix carbon dioxide (binding the gaseous molecules to dissolved compounds inside the plant) for sugar production through photosynthesis. ... A diagram of a thoracic vertebra. ... The term spinal nerve generally refers to the mixed spinal nerve, which is formed from the dorsal and ventral roots that come out of the spinal cord. ... Complement component 4 is a protein involved in the complement system. ...

• USS C-4 (SS-15), a United States C class submarine of the United States Navy
• HMS C4, a British C class submarine of the Royal Navy
• USS Philadelphia (C-4), a protected cruiser of the United States Navy
• C-4 Academe, the military version of Gulfstream I twin turboprop business aircraft
• AEG C.IV, a German World War I reconnaissance aircraft
• Citroën C4, a car made by Citroën
• Chevrolet Corvette C4, the fourth production design of the Chevrolet Corvette
• Ford C4 transmission, an automatic transmission
• C-4, the US Army designation of the Ford Trimotor.

In paper: USS C-4 (SS-15) was a C-class submarine of the United States Navy. ... HMS C4 was a British C class submarine built by Vickers at Barrow. ... The fourth USS Philadelphia (C-4), also known as Cruiser No. ... C-4 Academe is the US military designation for Grumman Gulfstream I twin turboprop business airplane. ... The AEG C.IV was a two-seat biplane reconnaissance aircraft based on the C.II but featuring a larger wingspan. ... Rear of a Citroën C4 three-door The Citroën C4 is a small family car produced by French automaker Citroën since autumn 2004. ... The fourth generation Chevrolet Corvette was introduced at the close of 1982 production as a 1984 model and ended in 1996, meaning that theres no such thing as a 1983 Corvette (though 44 prototype 1983s were built, of which #23 surivives today and is housed at the National Corvette... The Ford C4 is a three-speed, light-duty automatic transmission introduced in the 1964 model year and produced through the mid-1970s. ... Ford Trimotor G-CYWZ of the Royal Canadian Air Force. ...

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

In computing: Comparison of the most common paper sizes. ... International standard sizes International standard ISO 269 defines several standard envelope sizes, which are designed for use with ISO 216 standard paper sizes: The German standard DIN 678 defines a similar list of envelope formats. ...

• 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

In music and television: This page may meet Wikipedia’s criteria for speedy deletion. ... A flip chip is one type of IC chip mounting which does not require any wire bonds. ... C4 was the originally planned nomenclature for some members of the VIA C3 and VIA C7 processors. ... C4 is a Macintosh software developers conference that was held for the first time in Chicago on October 20, October 21 and October 22, 2006. ... The C4 Engine is an emerging next-generation computer game engine created by Eric Lengyel. ... CodeWeavers is a company that sells a proprietary version of Wine called CrossOver Office, for running Windows applications on GNU/Linux. ... Look up Crossover in Wiktionary, the free dictionary. ...

• 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
• C-4 (rapper)
• C4 Records, a record label
• C-4 (punk rock band) A racist punk band from Columbia, MO

Other: It has been suggested that Channel Four Television Corporation be merged into this article or section. ... C4 is a music television station operating in New Zealand and owned by Canwest MediaWorks NZ, a company 70% owned by Canadian broadcasting conglomerate Canwest. ... In Western music, the expression middle C refers to the note C or Do located exactly between the two staves of the grand staff, quoted as C4 in note-octave notation (also known as scientific pitch notation). ... C4 Records is the production company of record producer Brandon Friesen and attorney/Tin Foil Phoenix drummer Steven Kray. ...

• C4 is the IATA code for Zimex Aviation Limited
• 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 employement
• C4, or CIV: Star Wars Celebration IV, held in Los Angeles.

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