C3, C-3, C.3, C03, C.III or C-III may refer to:

Life and biology

C3-convertase C3 convertase (''C4bC2b'', formerly ''C4b2a'') belongs to family of serine proteases and is necessary in innate immunity as a part of the complement system which eventuate in opsonisation of particles, release of inflammatory peptides, C5 conve ...

, an enzyme *

Complement component 3 Complement component 3, often simply called C3, is a protein of the immune system. It plays a central role in the complement system and contributes to innate immunity. In humans it is encoded on chromosome 19 by a gene called ''C3''. Function C ...

, a protein of the innate immune system *

Apolipoprotein C3 Apolipoprotein C-III also known as apo-CIII, and apolipoprotein C3, is a protein that in humans is encoded by the ''APOC3'' gene. Apo-CIII is secreted by the liver as well as the small intestine, and is found on triglyceride-rich lipoproteins such ...

, a human very low density lipoprotein * ATC code C03 ''Diuretics'', a subgroup of the Anatomical Therapeutic Chemical Classification System *

Castavinol C3 Castavinol C3 is a castavinol, a natural phenolic compound found in red wines.Castavinol, a new series of polyphenols from Bordeaux red wines. Chantal Castagnino and Joseph Vercauteren, Tetrahedron Letters, Volume 37, Issue 43, 21 October 1996, p ...

, a natural phenolic compound found in red wines * Cytochrome-c3 hydrogenase, an enzyme *

Haplogroup C-M217 } Haplogroup C-M217, also known as C2 (and previously as C3), is a Y-chromosome DNA haplogroup. It is the most frequently occurring branch of the wider Haplogroup C (M130). It is found mostly in Central Asia, Eastern Siberia and significant fre ...

, called C3 in older publications * In human anatomy, C3 may refer to: **

Cervical vertebra 3 In tetrapods, cervical vertebrae (singular: 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 sau ...

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

Cervical spinal nerve 3 The cervical spinal nerve 3 (C3) is a spinal nerve of the cervical segment.American Medical Association ...

Clinical Cell Culture Avita Medical is a clinical and commercial company developing and marketing a range of respiratory and regenerative products. The first regenerative medicine product brought to the market by Avita Medical was ReCell spray-on skin for the treatment ...

, a medical technology company * C03, Malignant neoplasm of gum ICD-10 code *

C3 Collaborating for Health C3 Collaborating for Health is a global, not-for-profit non-governmental organisation, based in London, that exists to find solutions to fight the epidemic of non-communicable diseases (NCDs). The C3 approach C3’s focus is on the main risk fac ...

, a health-promotion NGO * C3: an EEG electrode site according to the 10-20 system

Military

* C³,

Command, control, and communications Command and control (abbr. C2) is a "set of organizational and technical attributes and processes ... hatemploys human, physical, and information resources to solve problems and accomplish missions" to achieve the goals of an organization or en ...

, a military concept *

C-3 (plastic explosive) C3, C-3, C.3, C03, C.III or C-III may refer to: Life and biology * C3 carbon fixation in plants * C3-convertase, an enzyme * Complement component 3, a protein of the innate immune system * Apolipoprotein C3, a human very low density lipoprotein ...

, a plastic explosive related to C4 * C-3, a United States military designation for the

Ford Trimotor The Ford Trimotor (also called the "Tri-Motor", and nicknamed the "Tin Goose") is an American three-engined transport aircraft. Production started in 1925 by the companies of Henry Ford and ended on June 7, 1933, after 199 had been made. It w ...

* the designation for several German World War I and World War II armed reconnaissance aircraft **

AEG C.III The AEG C.III was a two-seat biplane reconnaissance aircraft, a single prototype of which was built during World War I. The aircraft featured an unusual fuselage design that completely filled the gap between the upper and lower sets of wings, to p ...

AGO C.III The AGO C.III was a German reconnaissance biplane of World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Rus ...

, a reconnaissance biplane of World War I **

Albatros C.III The Albatros C.III was a German two-seat general-purpose biplane of World War I, built by Albatros Flugzeugwerke. The C.III was a refined version of the successful Albatros C.I and was eventually produced in greater numbers than any other C-typ ...

** DFW C.III, a DFW aircraft *

NAG C.III The Conrad C.III was a six-cylinder, water-cooled inline aircraft engine designed by Robert Conrad. It was used on some German training aircraft during World War I. The engine was mainly produced under license by the German Nationale Automobil ...

, an engine powering the Gotha G.IV aircraft * C-3, a U.S. military transport version of the

Martin 4-0-4 The Martin 4-0-4 was an American pressurized passenger airliner built by the Glenn L. Martin Company. In addition to airline use initially in the United States, it was used by the United States Coast Guard and United States Navy as the RM-1G ( ...

Type C3 submarine (disambiguation) Type C3 submarine may refer to: * , also called Type C3 submarine or Type C Modified submarine (''Junsen Hei-gata-kai''), the first class submarine of the Imperial Japanese Navy * , also called Type C3 submarine (''C3-gata''), the third class subma ...

, a World War II Imperial Japanese Navy cargo carrier submarine * Spanish submarine ''C-3'' * HMS ''C3'', a 1906 British C class submarine *

Type C3-class ship Type C3-class ships were the third type of cargo ship designed by the United States Maritime Commission (MARCOM) in the late 1930s. As it had done with the Type C1 ships and Type C2 ships, MARCOM circulated preliminary plans for comment. The desi ...

, a type of merchant cargo ships of United States Maritime Commission "C" design * USS ''C-3'' (SS-14), a 1909 United States C class submarine * USS ''Baltimore'' (C-3), an 1888 protected cruiser of the United States Navy *

Garda Crime and Security Branch , headquarters = Phoenix Park, Dublin (D8) , formed = , picture = File:Badge of An Garda Síochána.svg , picture_width = , picture_caption = , preceding1 = C3 , preceding2 = , jurisdiction = Ireland , employees = Undisclosed , budg ...

(CSB), domestic security agency of Ireland's national police, also known as "C3" * C3 Howitzer, a lengthened variant of the M101 used by the Canadian Armed Forces

Technology

* C₃,

characteristic energy In astrodynamics, the characteristic energy (C_3) is a measure of the excess specific energy over that required to just barely escape from a massive body. The units are length2 time−2, i.e. velocity squared, or energy per mass. Every object in ...

, in astrodynamics, a measure of the rocket energy for an interplanetary mission that requires attaining an orbital velocity above escape velocity * C₃, the chemical symbol for **

Tricarbon Tricarbon (systematically named 1λ2,3λ2-propadiene and ''catena''-tricarbon) is an inorganic compound with the chemical formula (also written (μ-C)Cor ). It is a colourless gas that only persists in dilution or solution as an adduct. It is ...

Cyclopropatriene Cyclopropatriene is a hypothetical compound () which is an allotrope of carbon. It was once proposed as a candidate for a spectroscopically observed tricarbon species. It is a cyclic cumulene In organic chemistry, a cumulene is a compound h ...

* C3.ai, an AI company founded by

Thomas Siebel Thomas M. Siebel (; born November 20, 1952) is an American billionaire businessman, technologist, and author. He was the founder of enterprise software company Siebel Systems and is the founder, chairman, and CEO of C3.ai, an artificial intellig ...

C3 linearization "In object-oriented systems with multiple inheritance, some mechanism must be used for resolving conflicts when inheriting different definitions of the same property from multiple superclasses." C3 superclass linearization is an algorithm used prim ...

, a computer science algorithm for resolving the order of method resolution in multiple inheritance conditions *

Delfi-C3 Delfi-C3 is a CubeSat satellite constructed by students at the Delft University of Technology in the Netherlands. It is a 3-unit CubeSat, and was launched at 03:53:42 on 28 April 2008, as part of the NLS-4 mission, aboard a PSLV rocket, from the S ...

, a Dutch CubeSat satellite *

Saturn C-3 The Saturn C-3 was the third rocket in the Saturn C series studied from 1959 to 1962. The design was for a three-stage launch vehicle that could launch to low Earth orbit and send to the Moon via trans-lunar injection. U.S. President Kennedy's ...

, a 1960 rocket in the Saturn C series *

Chaos Communication Congress The Chaos Communication Congress is an annual conference organized by the Chaos Computer Club. The congress features a variety of lectures and workshops on technical and political issues related to security, cryptography, privacy and online ...

, the biggest annual hacker event in Europe *

Chrysler Comprehensive Compensation System The Chrysler Comprehensive Compensation System (commonly referred to as "C3") was a project in the Chrysler Corporation to replace several payroll applications with a single system. The new system was built using Smalltalk and GemStone. The softwar ...

, important in the development of Extreme Programming *

VIA C3 The VIA C3 is a family of x86 central processing units for personal computers designed by Centaur Technology and sold by VIA Technologies. The different CPU cores are built following the design methodology of Centaur Technology. In addition to ...

, a computer processor * ''

Creatures 3 ''Creatures 3'' is the third game in the '' Creatures'' a-life game series made by Creature Labs. In this installment, the Shee have left Albia in a spaceship, the Shee Ark, to search for a more spherical world. The Ark was abandoned by the Shee ...

'', a 1999 video game * ''

Crysis 3 ''Crysis 3'' is a 2013 first-person shooter video game developed by Crytek and published by Electronic Arts. It is the third game of the ''Crysis'' series, a sequel to the 2011 video game ''Crysis 2''. The multiplayer portion of the game was d ...

'', a 2013 video game * Cluster 3, also known as Samba, an ESA satellite

Transportation

* Bavarian C III, a German steam locomotive model * Bavarian C III (Ostbahn), an 1867 German steam locomotive model *

Chevrolet Corvette (C3) The Chevrolet Corvette (C3) is a sports car that was produced from 1967 until 1982 by Chevrolet for the 1968 to 1982 model years. Engines and chassis components were mostly carried over from the previous generation, but the body and interior we ...

, the third production design of the Chevrolet Corvette *

Circumferential Road 3 Circumferential Road 3 (C-3), informally known as the C-3 Road, is a network of roads and bridges that all together form the third beltway of Metro Manila in the Philippines. Spanning some , it connects the cities of Caloocan, Makati, Navotas ...

or C-3, an arterial road of Manila, Philippines *

Cierva C.3 __NOTOC__ The Cierva C.3 was an experimental autogyro built by Juan de la Cierva in Spain in 1921. It was based on the fuselage of a Sommer monoplane, and was actually completed and tested before that aircraft. The C.3 utilised a single, three-b ...

, a 1921 Spanish experimental autogyro *

Citroën C3 The Citroën C3 is a supermini car (B-segment) produced by Citroën since April 2002. It replaced the Citroën Saxo in the model line up, and is currently in its third generation. The third generation model made its appearance in June 2016, and ...

, a car * LB&SCR C3 class, a British LB&SCR locomotive *

London Buses route C3 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva London, ...

, a Transport for London contracted bus route *

C3 (railcar) The C3 is a bi-level coach railroad car built by Kawasaki. These cars began delivery in 1997, ordered by the Metropolitan Transportation Authority for the Long Island Rail Road. The rail cars are pulled and pushed by EMD DE30AC and DM30AC over ...

, a bi-level railcar built by Kawasaki Railcar for the non-electrified branches of the Long Island Rail Road * Nimrod NRA/C3, a 1983 Group C racing car never achieved * Yamaha C3, a 2007 liquid cooled 49cc four-stroke motor scooter * Two different ring expressways in Japan where numbered C3: **

Tokyo Gaikan Expressway The is a national expressway in Japan. It is owned and operated by East Nippon Expressway Company. Overview The name Gaikan refers to the route's status as an outer ring road (beltway) for Tokyo. The expressway is also referred to simply as G ...

in Tokyo, Saitama and Chiba Prefectures **

Tōkai-Kanjō Expressway The (lit. Tōkai Ring Expressway) is a toll road in the Tōkai region of Japan. It is owned and managed by Central Nippon Expressway Company. Naming Officially, the route is designated as National Route 475. On some signs, the expressway is re ...

in Aichi, Gifu and Mie Prefectures

Music

* Hammond C3 organ *

High C C or Do is the first note and semitone 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 frequ ...

in music (c3 in European notation) *

Low C C or Do is the first note and semitone 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 frequen ...

in music (C3 in American notation) * ''

Tha Carter III ''Tha Carter III'' is the sixth studio album by American rapper Lil Wayne, released on June 10, 2008, by Cash Money, Universal Motown & Young Money Entertainment. It follows a long string of mixtape releases and guest appearances on other hip h ...

'', the title of an album by rapper Lil Wayne *

C3 Presents C3 Presents is a concert promotion, event production and artist management company based out of Austin, Texas. C3 also produces several multi-day festivals including Austin City Limits Music Festival in Texas, Voodoo Music + Arts Experience in Ne ...

, independent American concert promoters

Other uses

C3 (classification) C3 is a para-cycling classification. The class includes people with moderate upper or lower limb dysfunctions and includes cyclists with cerebral palsy, limb impairments and amputations. The UCI recommends this be coded as MC3 or WC3. The class ...

, a para-cycling classification * ''C³'' (light novel), a 2011 Japanese light novel series and anime by Hazuki Minase * C3, a New Zealand logistics company owned by

Linx Cargo Care Group Linx Cargo Care Group is a transportation and logistics company in Australia and New Zealand – headquartered in Sydney. History Linx Cargo Care Group was founded in August 2016 when Asciano was broken up in August 2016. The Patrick Bulk and ...

* C3, the code for permission to use specific land or premises for dwellings in

town and country planning in the United Kingdom Town and country planning in the United Kingdom is the part of English land law which concerns land use planning. Its goal is to ensure sustainable economic development and a better environment. Each country of the United Kingdom has its own pla ...

* C3, the

UEFA Europa League The UEFA Europa League (abbreviated as UEL, or sometimes, UEFA EL), formerly the UEFA Cup, is an annual football club competition organised since 1971 by the Union of European Football Associations (UEFA) for eligible European football clubs. It ...

in football * C3, a standard paper size defined in

ISO 216 ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size ...

Tippmann C-3 The Tippmann C-3 was the first propane powered paintball marker. It operates on a unique system Tippmann calls 'Propane Enhanced Performance'. The name 'C-3' may refer to the chemical formula of propane, C3H8. Operation While traditional Pain ...

, a pump-action paintball marker that uses propane gas *

C3 Church Global C3 Church Global, formerly known as Christian City Church International (C3i), is a charismatic movement founded by Phil Pringle and Christine Pringle. The first church was started in Dee Why on the Northern Beaches of Sydney, Australia, and is ...

, a worldwide Pentecostal denomination * C3, a class in FM radio broadcasting in North America *

Argus C3 The Argus C3 was a low-priced rangefinder camera mass-produced from 1939 to 1966 by Argus in Ann Arbor, Michigan, United States. The camersold over 2.2 million units making it one of the most popular American cameras in history. Due to its shape ...

, a 35mm rangefinder camera * Nokia C3 (disambiguation), various Nokia cellphones * Caldwell 3 (

NGC 4236 NGC 4236 (also known as Caldwell 3) is a barred spiral galaxy located in the constellation Draco. The galaxy is a member of the M81 Group, a group of galaxies located at a distance of approximately 11.7 Mly (3.6 Mpc) from Earth. The group ...

), a barred spiral galaxy in Draco * C3 policing, a methodology being employed by police to combat gangs in Springfield, Massachusetts *

Nielsen ratings Nielsen Media Research (NMR) is an American firm that measures media audiences, including television, radio, theatre, films (via the AMC Theatres MAP program), and newspapers. Headquartered in New York City, it is best known for the Nielsen rat ...

that include recorded programs watched three days later * Championing Community Children, a Philippine charitable organization abbreviated as C3 *

Charles Keating III Charles Humphrey Keating III (nicknamed C3; born August 20, 1955) is an American former competitive swimmer and real estate executive. He represented the United States in swimming at the 1976 Summer Olympics in Montreal, Quebec. He was convicted ...

(born 1955), American former swimmer and real estate executive *

Charles III Charles III (Charles Philip Arthur George; born 14 November 1948) is King of the United Kingdom and the 14 other Commonwealth realms. He was the longest-serving heir apparent and Prince of Wales and, at age 73, became the oldest person to ...

(born 1948), King of the United Kingdom and 14 other Commonwealth realms since 2022. * C-III Capital Partners, an

asset management Asset management is a systematic approach to the governance and realization of value from the things that a group or entity is responsible for, over their whole life cycles. It may apply both to tangible assets (physical objects such as buildings ...