C20 or C-20 may refer to:
Science and technology
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Carbon-20
Carbon (6C) has 14 known isotopes, from to as well as , of which only and are stable nuclide, stable. The longest-lived radionuclide, radioisotope is , with a half-life of years. This is also the only carbon radioisotope found in nature, as ...
(C-20 or
20C), an isotope of carbon
* C
20, the smallest possible
fullerene (a carbon molecule)
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C20 (engineering), a mix of concrete that has a compressive strength of 20 newtons per square millimeter
* Malignant neoplasm of rectum, a type of
colorectal cancer
Colorectal cancer (CRC), also known as bowel cancer, colon cancer, or rectal cancer, is the development of cancer from the Colon (anatomy), colon or rectum (parts of the large intestine). Signs and symptoms may include Lower gastrointestinal ...
(ICD-10 code: C20)
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Caldwell 20 or North America Nebula, an emission nebula in the constellation Cygnus
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IEC 60320 C20, a polarised, three pole socket electrical connector
* C20 (Capacity, 20 hours), C100 (100 hours),
battery capacity
Transportation and military
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Colt Canada C20 DMR, a Canadian designated marksman rifle
* , a 1910 British C-class submarine
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Sauber C20, a 2001 racing car
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SL C20, a type of rolling stock used in the Stockholm metro
* , a cruiser of the Royal Navy
* C-20, the proposed in-service designation of the
Fokker F-32
* C-20A/B/C/D/E, variants of the
Gulfstream III
The Gulfstream III, a business jet produced by Gulfstream Aerospace, is an improved development of the Grumman Gulfstream II.
The U.S. military uses versions of the Gulfstream III as the C-20A/B/C/D/E aircraft, though later C-20 F/G/H/J are Gu ...
* C-20F/G/H/J, variants of the
Gulfstream IV
* C20 is a version of the
Allison Model 250 aircraft engine
Other uses
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Bill C-20, the Canadian Clarity Act
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OMX Copenhagen 20, Denmark's primary stock market index
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King's Pawn Game
The King's Pawn Game is any chess opening starting with the move:
: 1. b:Chess Opening Theory/1. e4, e4
It is the most popular opening move in chess, followed by 1.d4, the Queen's Pawn Game.
Principles
White opens with the most popular of the ...
, a chess opening (Encyclopaedia of Chess Openings code: C20)
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The Twentieth Century Society, a British charity which campaigns for the preservation of architectural heritage from 1914 onwards
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C20 Cities, now expanded to the C40 Cities Climate Leadership Group
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