C2

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

C

2

{\displaystyle \mathbb {C} ^{2}}

, 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 aka 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.