C4, C04, C.IV, C-4, or C-04 often refers to the explosive. It may refer to:

Places

* Caldwell 4 or NGC 7023 or

Iris Nebula The Iris Nebula (also known as NGC 7023 and Caldwell catalogue, Caldwell 4) is a bright reflection nebula in the constellation Cepheus (constellation), Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebul ...

, a reflection nebula in the constellation Cepheus * Circumferential Road 4 or C-4, an arterial road of Manila, Philippines *

Ken-Ō Expressway The , or , is a partially completed ticket system toll expressway in Japan. It is owned and operated by the Central Nippon Expressway Company and East Nippon Expressway Company. In conjunction with the Tokyo Bay Aqua-Line and the Bayshore Ro ...

, a road in Japan (includes some sections of Shin-Shōnan Bypass) *

Omote-sandō Station is a Tokyo Metro subway station located at the intersection of Omotesandō, Tokyo, Omotesandō (Avenue Omotesandō) and Aoyama-dori (Aoyama Street) in Aoyama, Minato, Tokyo, Aoyama, Minato, Tokyo, Minato ward, Tokyo, Japan. Part of the Chiyoda L ...

, a Tokyo Metro subway station (station number: C-04) *Wadi C-4, designation for the

Tomb of Thutmose II The Tomb of Thutmose II is a royal ancient Egyptian tomb located in the Wadi Gabbanat el-Qurud area west of Luxor. The tomb, also known by its tomb number Wadi C-4, belonged to Thutmose II, a pharaoh of the 16th–15th centuries BC. The tomb la ...

People

* C4 (rapper), a rap music producer from Birmingham, England * Clarence Mitchell IV, American radio host and former politician * Chris Turner, sometimes credited as Chris Heiner, a.k.a. "C4", Australian musician, part of Modern Day Poets

Computing

C4 (conference) C4 was a Macintosh software developers conference held in Chicago, Illinois. The conference ran from 2006 through 2009. It was created by Jonathan Rentzsch after the demise of MacHack. In May 2010 Rentzsch announced that he would no longer operat ...

, a Macintosh software developers conference * C4 Engine, a next-generation 3D game engine * C4 model, a graphical notation technique for diagramming software architecture * Cx4 chip, an add-on microprocessor chip employed by certain Super NES game cartridges (often incorrectly referred to as the ''C4 chip'') * Controlled collapse chip connection or

flip chip Flip chip, also known as controlled collapse chip connection or its abbreviation, C4, is a method for interconnecting dies such as semiconductor devices, IC chips, integrated passive devices and microelectromechanical systems (MEMS), to exter ...

, a method for interconnecting semiconductor devices * VIA C4, a planned design of central processing unit for a personal computer

Arts, entertainment, and media

Music

* C4 (American band), a neo-classical metal band set up by Michael Angelo Batio * C4 (French band), French boyband * ''C4'' (mixtape), mixtape by American rapper Kendrick Lamar * C₄, scientific pitch notation for the note "

Middle C C or Do is the first note of the C major scale, the third note of the A minor scale (the relative minor of C major), and the fourth note (G, A, B, C) of the Guidonian hand, commonly pitched around 261.63 Hz. The actual frequency has d ...

" (261.626 Hz) * C4 Records, a record label

Other uses in arts, entertainment and media

C4 (New Zealand TV channel) C4 was a New Zealand television channel owned and operated by MediaWorks New Zealand. C4 was available on both digital terrestrial and satellite platforms and played music around the clock, including music from C4's sister radio division from ...

, a former New Zealand television music channel * 1. c4, also called the

English Opening The English Opening is a chess opening that begins with the move: : 1. c4 A flank opening, it is the fourth most popular and, according to various databases, one of the four most successful of White's twenty possible first moves. White begins ...

, a chess opening * The abbreviation for British TV channel

Channel 4 Channel 4 is a British free-to-air public broadcast television channel owned and operated by Channel Four Television Corporation. It is state-owned enterprise, publicly owned but, unlike the BBC, it receives no public funding and is funded en ...

Mathematics, science and technology

Biology

* C4: an EEG electrode site according to the 10-20 system *

Apolipoprotein C4 Apolipoprotein C-IV, also known as apolipoprotein C4, is a protein that in humans is encoded by the ''APOC4'' gene. Function ''APOC4'' is a member of the apolipoprotein C gene family. It is expressed in the liver and has a predicted protein st ...

, a protein encoded by the ''APOC4'' gene *

c4 antisense RNA The c4 antisense RNA is a non-coding RNA used by certain phages that infect bacteria. It was initially identified in the P1 and P7 phages of ''E. coli''. The identification of c4 antisense RNAs solved the mystery of the mechanism for regula ...

, a non-coding RNA *

ATC code C04 C04A Peripheral vasodilators C04AA 2-amino-1-phenylethanol derivatives :C04AA01 Isoxsuprine :C04AA02 Buphenine :C04AA31 Bamethan C04AB Imidazoline derivatives :C04AB01 Phentolamine :C04AB02 Tolazoline C04AC Nicotinic acid and derivatives : ...

''Peripheral vasodilators'', a subgroup of the Anatomical Therapeutic Chemical Classification System * C₄ carbon fixation, a pathway for carbon fixation in photosynthesis that produces C4 plants *

Cervical spinal nerve 4 Cervical spinal nerve 4, also called C4, is a spinal nerve of the cervical segment. It originates from the spinal cord above the 4th cervical vertebra (C4). It contributes nerve fibers to the phrenic nerve, the motor nerve to the thoracoabdomin ...

, a nerve originating in the neck *

Cervical vertebra 4 In tetrapods, cervical vertebrae (: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie caudal (toward the tail) of cervical vertebrae. In sauropsid s ...

, one of the cervical vertebrae of the vertebral column * C04,

oral cancer Oral cancer, also known as oral cavity cancer, tongue cancer or mouth cancer, is a cancer of the lining of the lips, mouth, or upper throat. In the mouth, it most commonly starts as a painless red or white patch, that thickens, gets ulcerated ...

ICD-10 code *

Complement component 4 Complement component 4 (C4), in humans, is a protein involved in the intricate complement system, originating from the human leukocyte antigen (HLA) system. It serves a number of critical functions in immunity, tolerance, and autoimmunity with ...

, a protein involved in the intricate

complement system The complement system, also known as complement cascade, is a part of the humoral, innate immune system and enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism, promote inf ...

, encoded by ''C4A'' or ''C4B'' gene in humans *C₄ fragments, one of the types of products of

catabolism Catabolism () is the set of metabolic pathways that breaks down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions. Catabolism breaks down large molecules (such as polysaccharides, lipid ...

pathways

Mathematics

C_4

, the

cyclic group In abstract algebra, a cyclic group or monogenous group is a Group (mathematics), group, denoted C_n (also frequently \Z_n or Z_n, not to be confused with the commutative ring of P-adic number, -adic numbers), that is Generating set of a group, ge ...

of order 4 * C4, the fourth pure "core" module in the

Edexcel Edexcel (also known since 2013 as Pearson Edexcel) is a British multinational education and examination body formed in 1996 and wholly owned by Pearson plc since 2005. It is the only privately owned examination board in the United Kingdom. It ...

A-level mathematics examination

Other uses in science and technology

C-4 (explosive) C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odor ...

, a high explosive solid * C4, butyl-type hydrocarbon chain, a type of four-carbon molecule, especially in C4 reversed-phase chromatography columns * Cluster 4, an ESA satellite that studies the Earth's magnetosphere over the course of an entire solar cycle * C-4 Protective Mask, standard issue gas mask of the Canadian Armed Forces.

Organizations

* C4 (Colombia), a political party in Colombia * C4, a social welfare non-profit entity organized under section

501(c)(4) A 501(c) organization is a nonprofit organization in the Law of the United States#Federal law, federal law of the United States according to Internal Revenue Code (26 U.S.C. § 501(c)). Such organizations are exempt from some Taxation in the Un ...

of the U.S. Internal Revenue Code * Churches Covered and Connected in Covenant, a religious association founded by Archbishop LeRoy Bailey Jr. *

Craiova Group The Craiova Group (Quadrilateral), Craiova Four, or C4 is a cooperation project of four European statesRomania, Bulgaria, Greece and Serbiafor the purposes of furthering their European integration as well as economic, transport and energy cooper ...

, a cooperation project of four European states

Sports

C4 (classification) C4 is a para-cycling classification. It includes people with lower limb impairments or issues with lower limb functionality. Disability groups covered by this classification include people with cerebral palsy, amputations and other lower limb i ...

, a Paralympic cycling classification * C-4, professional wrestler

Paul Burchill Paul Birchall (born 8 October 1979), better known by his ring name Paul Burchill, is an English professional wrestler, currently making appearances for the National Wrestling Alliance under the ring name Burchill (shortened from his previous rin ...

's name for his finishing move, a moonsault uranage * C4, an abbreviation for a four-man Sprint Canoe, see

Canoe racing A canoe is a lightweight, narrow watercraft, water vessel, typically pointed at both ends and open on top, propelled by one or more seated or kneeling paddlers facing the direction of travel and using paddles. In British English, the term ' ...

* C4, a term used to refer to the

UEFA Intertoto Cup The UEFA Intertoto Cup (from , "between" and , " betting pool"),Most precisely, from ( football pool); cf. originally called the International Football Cup, was a summer football competition between European clubs. The competition was dis ...

, a football competition (mainly used in non-English speaking countries) * C4 level, a

challenge square dance Challenge square dance, also known as Challenge dancing, is modern western square dance focused on the puzzle-solving aspects of square dancing at the most difficult or "challenging" levels. In modern square dancing, the dancers interpret the cal ...

program at the Challenge 4 level

Stationery

* C4, an international standard

paper size Paper size refers to Technical standard, standardized dimensions for sheets of paper used globally in stationery, printing, and technical drawing. Most countries adhere to the ISO 216 standard, which includes the widely recognized A series ( ...

(229 × 324 mm), defined in ISO 216 * C4, the envelope size matching the A4 paper size

Vehicles

Aircraft

* C-4, the US Army designation of the

Ford Trimotor The Ford Trimotor (also called the "Tri-Motor", and nicknamed the "Tin Goose") is an American Trimotor, three-engined transport plane, transport aircraft. Production started in 1925 by the companies of Henry Ford and ended on June 7, 1933, afte ...

* AEG C.IV, a German World War I reconnaissance aircraft * AGO C.IV, a 1917 German reconnaissance aircraft * C-4 Academe, the military version of Gulfstream I twin turboprop business aircraft * C-4 Argonaut, a Canadair aircraft derived from the Douglas DC-4 * 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

Automobiles

* C4, a class of

Audi 100 The Audi 100 and Audi 200 (and sometimes called Audi 5000 in North America) are primarily mid-size/executive cars manufactured and marketed by the Audi division of the Volkswagen Group. The car was made from 1968 to 1997 across four generations (C ...

and Audi A6 cars *

Chevrolet Corvette (C4) The Chevrolet Corvette (C4) is the fourth generation of the Chevrolet Corvette, Corvette sports car, produced by American automobile manufacturer Chevrolet from 1983 until 1996. The convertible returned, as did higher performance engines, exem ...

, the fourth production design of the Chevrolet Corvette *

Citroën C4 The Citroën C4 is a car produced by Citroën, part of Stellantis. It was positioned to be the successor to the Citroën Xsara. The first generation production started in September 2004. For its first two generations, the C4 was a compact car/s ...

, 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 Spyker or Spijker was a Dutch carriage, automobile and aircraft manufacturer, started in 1880 by blacksmiths Jacobus and Hendrik-Jan Spijker. Originally located in Hilversum, the company relocated to Trompenburg, Amsterdam in 1898. Notable produ ...

car

Locomotives

* Bavarian C IV, an 1884 German steam locomotive * GS&WR Class C4, a

Great Southern and Western Railway The Great Southern and Western Railway (GS&WR) was an Irish gauge () railway company in Ireland from 1844 until 1924. The grew by building lines and making a series of takeovers, until in the late 19th and early 20th centuries it was the larges ...

Irish steam locomotive * LNER Class C4, a class of British steam locomotives

Ships

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

Type C4 ship The Type C4-class ship were the largest cargo ships built by the United States Maritime Commission (MARCOM) during World War II. The design was originally developed for the American-Hawaiian Lines in 1941, but in late 1941 the plans were taken ov ...

, merchant cargo ships of United States Maritime Commission "C" design * 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

Vehicle components

Ford C4 transmission The Ford C4 is a three-speed, medium-duty automatic transmission introduced on 1964 model year vehicles and produced through 1981. The C4 was designed to be a lighter and simpler replacement for the original Ford-O-Matic two speed transmission be ...

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

Weapons

, a type of plastic explosive * Hafdasa C-4, an Argentine submachine gun

Other uses

* C4, a variation of Command and control, meaning "Command, Control, Communications and Computers" * C4, the monogram of

Christian IV of Denmark Christian IV (12 April 1577 – 28 February 1648) was King of Denmark and King of Norway, Norway and List of rulers of Schleswig-Holstein, Duke of Holstein and Schleswig from 1588 until his death in 1648. His reign of 59 years and 330 days is th ...

, used in the city arms of Kristianstad, Sweden since 1622 * C4 Extreme, a sports nutrition supplement product line by

Cellucor Cellucor is an American sports nutrition brand, specializing in dietary supplements, bodybuilding supplements, and energy drinks. Cellucor's parent company is Nutrabolt, an independently owned private sports nutrition company headquartered in A ...

, which includes C4 energy drinks.