C2 or a derivative (C-2, C2, etc.) may refer to:
Mathematics and physics C2, one of the common notations for the cyclic group of order 2 C2 differentiability class C2 or , the complex coordinate plane c2, the square of the speed of light (in the mass–energy equivalence formula) c2, hypotenuse squared in the Pythagorean theorem C2 (space group), three-dimensional space group number 5
Biology C2 domain, a protein structural domain C2 regulatory sequence for the insulin gene Apolipoprotein C2, a human apolipoprotein In human anatomy, C2 may refer to: Cervical vertebra 2, the axis, one of the cervical vertebrae of the vertebral column Cervical spinal nerve 2 Chlorophyll c2, a form of chlorophyll Complement component 2 Procyanidin C2, a plant phenolic compound Prodelphinidin C2, a plant phenolic compound Vitamin C2 the ATC code for Antihypertensives, a subgroup of the Anatomical Therapeutic Chemical Classification System C2 fragments, one of the types of products of catabolism pathways Haplogroup C-M217, also known as C2, a Human Y-chromosome DNA haplogroup
Chemistry C2, Diatomic carbon, a molecule made of two carbon atoms C2=, ethylene, a two carbon alkene
Codes or abbreviations C2 may be a code or abbreviation for: C2 Aquarii, a star C2 Centauri, a star C2 (Code Geass), an anime character C2 explosive, a form of plastic explosive C2 pylon, a type of high voltage pylon C2 radio class, a class in FM broadcasting in America C2 (classification), a para-cycling classification Group C2, the secondary class of Group C sports car racing Nimrod NRA/C2, a 1982 Group C racing car C2, an international standard paper size defined in ISO 216 (458×648 mm) C2, a level in the Common European Framework of Reference for Languages C2, the NRS social grade between C1 and D C2s, substances listed in Schedule II of the Controlled Substances Act in the United States Command and control, the exercise of authority by a commanding officer over military forces in the accomplishment of a mission Air Luxor IATA airline code C2 Pictures, a film company related to Carolco Pictures Bill C-2, various legislation of the Parliament of Canada C2, or C2 a note-octave in music, aka Low C
Computing
C2, a computer security class, defined in the Trusted Computer System Evaluation Criteria C2, a bytecode compiler that is part of the HotSpot virtual machine implementation C2 (protocol), a 1985 Commodore file transfer protocol C2 error, a read error of a compact disc C2.com or WikiWikiWeb, the first user-editable website C2 (consulting firm), an initialism for, and Cunningham and Cunningham, a technology consulting firm founded by Ward Cunningham Cryptomeria cipher, a cipher used in digital rights management Command and control (malware) Codec 2, speech compression codec.
Transportation and space C2 class Melbourne tram Bavarian C II (Ostbahn), an 1862 German steam locomotive Bavarian C II.1, an 1857 German steam locomotive Bavarian C II.2, an 1861 German steam locomotive Chevrolet Corvette (C2), the generation of the Chevrolet Corvette produced between 1962 and 1967 Citroën C2, a car produced by Citroën in 2004 Cluster II (spacecraft), an ESA space mission Ford C2 platform, an automobile platform produced by Ford since 2018 GNR Class C2, a British 4-4-2 steam locomotive class LNER Class C2, classified C1 during GNR ownership Kawasaki C2, a bike London Buses route C2 LB&SCR C2 class, an 1893 British 0-6-0 steam locomotive Circumferential Road 2 or C-2, an arterial road of Manila, Philippines Saf-T-Liner C2, a school bus built by Thomas Built Buses Saturn C-2, a 1960 conceptual American launch vehicle Type C2 ship, a type of all-purpose cargo ship C2 (yacht), a luxury motor yacht Central Circular Route (Shuto Expressway) in Tokyo, Japan Mei-Nikan Expressway, route C2 in Nagoya, Japan
Military and aviation Command and control, the exercise of authority and direction by a commanding officer C-2 (poison), developed in the Poison laboratory of the Soviet secret services C2A1, Squad Automatic Weapon variant of the FN FAL formerly in Canadian Service ACAZ C.2, a Belgian prototype fighter aircraft of the 1920s AEG C.II, a German World War II armed reconnaissance aircraft Aeronca C-2, an American airplane AGO C.II, a German reconnaissance biplane of World War I Cierva C.2, a 1921 Spanish experimental autogyro DFW C.II, a World War I German reconnaissance aircraft Fokker C-2, the American military version of the Fokker F.VII aircraft C-2 Greyhound, the Grumman cargo aircraft of the United States Navy , a C-class submarine of the British Royal Navy Kawasaki C-2, a military transport aircraft LFG Roland C.II, a 1915 advanced German reconnaissance aircraft LVG C.II, a 1910s German two-seat reconnaissance biplane , a C-class submarine of the Spanish Navy , a C-class submarine of the United States Navy , a protected cruiser of the United States Navy
Other C2, UEFA Cup Winners' Cup in football, later merged with UEFA Cup (now UEFA Europa League) C2 Pictures, a film studio C-2 visa, a nonimmigrant visa which allows individuals to travel to and from the headquarters of the United Nations Coca-Cola C2, a soft drink launched by The Coca-Cola Company in 2004 Conduit 2, a 2011 first-person shooter video game AEW Continental Classic, a professional wrestling tournament
See also CO2 CII (disambiguation) 2C (disambiguation)