C2 may refer to:

• Citroën C2, a car produced by Citroën in 2004
• Vitamin C2, a name sometimes used for Choline
• C2 (protocol), a file transfer protocol
• C2 (radio), a Welsh language music show on BBC Radio Cymru
• C2 explosive, a form of plastic explosive
• C2 Educational Center is a supplemental education provider for students in grades K-12. C2 gives instruction in reading, writing, math, and test prepartion. C2 has over 100 locations throughout the United States. c2educate.com
• Coca-Cola C2, a soft drink launched by The Coca-Cola Company in 2004
• Sony Music C2, a music imprint
• Cryptomeria cipher, a cipher used in digital rights management
• Deep C note in music, the C under the bass clef
• C2, the second production design of the Chevrolet Corvette
• Second cervical vertebrae of the vertebral column, in human anatomy
• HMS C2, a British C class submarine of the Royal Navy
• C2, a computer program for analyzing and visualizing palaeoenvironmental data [1]

C2 may be a code for: The Citroën C2 is a supermini produced by the French manufacturer Citroën since 2004. ... Choline (trimethyl ethanolamine) is a quaternary saturated amine with the chemical formula (CH3)3N+CH2CH2OH. It was discovered by Strecker in 1862 and chemically synthesized in 1866. ... C2, also known as Punter, is a protocol for file transfer developed circa 1985 by Steve Punter. ... C2 is a Welsh language music show on BBC Radio Cymru. ... Plastic explosive (or plastique) is a specialised form of explosive material. ... Coca-Cola C2 (also referred to as Coke C2, C2 Cola, or simply C2) is a cola-flavored beverage introduced by The Coca-Cola Company first in Japan, then later on June 7, 2004 in the United States, in response to the low-carbohydrate diet trend. ... ... The Cryptomeria cipher, commonly refered to as C2 is a proprietary block cipher defined and licensed by the 4C Entity. ... Deep C is the C two octaves below Middle C, and is also named C2. ... The Chevrolet Corvette is a sports car that has been manufactured by Chevrolet since 1953. ... A cervical vertebra Cervical vertebrae (Vertebrae cervicales) are the smallest of the true vertebrae, and can be readily distinguished from those of the thoracic or lumbar regions by the presence of a foramen (hole) in each transverse process. ...

• Air Luxor, C2 IATA code
• ISO 216 C2 international standard paper size (458×648 mm)
• NRS social grade C2 for the United Kingdom is the skilled working class
• TCSEC C2 security class
• In town and country planning in the United Kingdom, C2 is the code for permission to use specific land or premises for residential institutions

C-2, C.2 or C.II may refer to: Air Luxor is a scheduled airline based in Lisbon in Portugal. ... ISO 216 specifies international standard (ISO) paper sizes, used in most countries in the world today. ... The NRS social grades are a system of demographic classification used in the United Kingdom. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... Town and Country Planning is the system by which the British government seeks to maintain a balance between economic development and environmental quality in England. ...

• C-2 Greyhound, The Grumman cargo aircraft of the United States Navy
• Atlantic C-2, an earlier US Army aircraft with the same designation
• USS C-2 (SS-13), a C-class submarine of the United States Navy
• USS Charleston (C-2), a protected cruiser of the United States Navy
• ACAZ C.2, a Belgian prototype fighter aircraft of the 1920s
• AEG C.II, a German World War II armed reconnaissance aircraft

This page disambiguates a two-character combination. If an article link referred you to this page, you may wish to change the link to point directly to the intended article.