C3

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

• C₃, the chemical symbol for
  • Tricarbon
  • Cyclopropatriene

• Haplogroup C-M217, called C3 in older publications
• In human anatomy, C3 may refer to:
  • Cervical vertebra 3, one of the cervical vertebrae of the vertebral column
  • Cervical spinal nerve 3
• Clinical Cell Culture, a medical technology company
• C03, Malignant neoplasm of gum ICD-10 code
• C3 Collaborating for Health, a health-promotion NGO
• C3: an EEG electrode site according to the 10-20 system
• Chromosome 3

• 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
• ATC code C03 Diuretics, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Castavinol C3, a natural phenolic compound found in red wines
• Cytochrome-c3 hydrogenase, an enzyme

• C3.ai, an AI company founded by Thomas Siebel
• Chaos Communication Congress, the biggest annual hacker event in Europe
• Chrysler Comprehensive Compensation System, important in the development of Extreme Programming
• C3, a programming language based on the C language
• Hexadecimal number C3 (decimal 195)
• VIA C3, a computer processor
• Argus C3, a 35mm rangefinder camera
• Nokia C3 (disambiguation), various Nokia cellphones

• Caldwell 3 (NGC 4236), a barred spiral galaxy in Draco
• C₃, characteristic energy, in astrodynamics, a measure of the rocket energy for an interplanetary mission that requires attaining an orbital velocity above escape velocity
• Delfi-C3, a Dutch CubeSat satellite
• Saturn C-3, a 1960 rocket in the Saturn C series
• Cluster 3, also known as Samba, an ESA satellite

• Command, control, and communications
• C-3 (plastic explosive), a plastic explosive related to C4
• C3 Howitzer, a lengthened variant of the M101, used by the Canadian Armed Forces
• Type C3-class ship, a type of merchant cargo ships of United States Maritime Commission "C" design
• USS Baltimore (C-3), an 1888 protected cruiser of the United States Navy

• C-3, a United States military designation for the Ford Trimotor
• the designation for several German World War I and World War II armed reconnaissance aircraft
  • AEG C.III
  • AGO C.III, a reconnaissance biplane of World War I
  • Albatros C.III
  • DFW C.III, a DFW aircraft
• NAG C.III, an engine powering the Gotha G.IV aircraft
• C-3, a U.S. military transport version of the Martin 4-0-4

• Type C3 submarine (disambiguation), a World War II Imperial Japanese Navy cargo carrier submarine
• Spanish submarine C-3
• HMS C3, a 1906 British C class submarine
• USS C-3 (SS-14), a 1909 United States C class submarine

• Aeronca C-3, an American airplane
• Cierva C.3, a 1921 Spanish experimental autogyro
• Yamaha C3, a 2007 liquid cooled 49cc four-stroke motor scooter
• Circumferential Road 3 or C-3, an arterial road of Manila, Philippines
• London Buses route C3, a Transport for London contracted bus route
• Two different ring expressways in Japan that are numbered C3:
  • Tokyo Gaikan Expressway in Tokyo, Saitama and Chiba Prefectures
  • Tōkai-Kanjō Expressway in Aichi, Gifu and Mie Prefectures

• Chevrolet Corvette (C3), the third production design of the Chevrolet Corvette, produced 1967–1982
• Citroën C3, French supermini, produced since 2002
• Cowin C3, subcompact sedan, manufactured by Chinese automaker Kaiyi Auto, 2014–2020
• Nimrod NRA/C3, a 1983 Group C racing car never achieved

• Bavarian C III, a German steam locomotive model, built 1868–1879
• Bavarian C III (Ostbahn), an 1867 German steam locomotive model
• LB&SCR C3 class, a British LB&SCR locomotive, built 1906
• C3 (railcar), a bi-level railcar built 1997–1999 by Kawasaki Railcar for the non-electrified branches of the Long Island Rail Road

• C-3 (TV channel) or Community 3, a children's channel launched 1977 on the QUBE cable system that later became Nickelodeon
• C³ (novel series), C Cube (Japanese: シーキューブ), or Cube×Cursed×Curious, a 2011 Japanese light novel series and anrrime by Hazuki Minase
• C3, a class in FM radio broadcasting in North America
• C3 (Live + 3), Nielsen ratings that include recorded programs watched three days later
• C3 Entertainment, formerly Comedy III Productions, an American entertainment and licensing company, founded 1959
• C3 (production company), founded by Richard H. Frank c. 1995, in affiliation with Comcast

• C3 Racing: Car Constructors Championship or Max Power Racing, 1998, developed by Eutechnyx and published by Infogrames Multimedia for the PlayStation
• Creatures 3, 1999, artificial life game developed by Creature Labs and published by Mindscape and Linux Game Publishing for desktop operating systems
• Crysis 3, 2013, first-person shooter developed by Crytek and published by Electronic Arts for various platforms

• Hammond C3 organ
• High C in music (c3 in European notation)
• Low C in music (C3 in American notation)
• Tha Carter III, 2008 album by rapper Lil Wayne
• C3 (Base Ball Bear album), 2020, Japanese rock
• C3 Presents, an American producer and promoter of international music events, founded 2007

• C3 (classification), a para-cycling classification
• C3, the UEFA Europa League in football
• Tippmann C-3, a pump-action paintball marker that uses propane gas
• Charles Keating III (born 1955), American former swimmer and real estate executive
• C3, a New Zealand logistics company owned by Linx Cargo Care Group
• C-III Capital Partners, an asset management and commercial real estate services company
• C3, a standard paper size defined in ISO 216
• C3, the code for permission to use specific land or premises for dwellings in town and country planning in the United Kingdom
• C3 policing ("Counter Criminal Continuum") or the Avghani model, a methodology being employed by police to combat gangs in Massachusetts, created by Michael M. Cutone c. 2009
• Garda Crime and Security Branch (CSB), domestic security agency of Ireland's national police, previously known as "C3"
• Charles III (born 1948), King of the United Kingdom and 14 other Commonwealth realms since 2022
• C-3 visa, a type of American non-immigrant visa for governmental officials and associated people

• C3 Church Global, a worldwide Pentecostal denomination
• Championing Community Children, a Philippine charitable organization abbreviated as C3