C18 may refer to:

Science and technology

* Caldwell 18 (

NGC 185 NGC 185 (also known as Caldwell 18) is a dwarf spheroidal galaxy located 2.08 million light-years from Earth, appearing in the constellation Cassiopeia. It is a member of the Local Group, and is a satellite of the Andromeda Galaxy (M31). NGC 18 ...

), a dwarf spheroidal galaxy of the Local Group in the constellation Cassiopeia * Carbon-18 (C-18 or ¹⁸C), an isotope of carbon * , the molecular formula of cyclo(18)carbon * C18, an octadecyl-type hydrocarbon with 18 carbon atoms, such as **

Fatty acid In chemistry, in particular in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated and unsaturated compounds#Organic chemistry, saturated or unsaturated. Most naturally occurring fatty acids have an ...

s such as ***

Stearic acid Stearic acid ( , ) is a saturated fatty acid with an 18-carbon chain. The IUPAC name is octadecanoic acid. It is a soft waxy solid with the formula . The triglyceride derived from three molecules of stearic acid is called stearin. Stearic acid ...

, C₁₈H₃₆O₂ ***

Oleic acid Oleic acid is a fatty acid that occurs naturally in various animal and vegetable fats and oils. It is an odorless, colorless oil, although commercial samples may be yellowish due to the presence of impurities. In chemical terms, oleic acid is cl ...

C₁₈H₃₄O₂ ** C18 bonded silica stationary phase column, a type of

reversed-phase chromatography Reversed-phase liquid chromatography (RP-LC) is a mode of liquid chromatography in which non-polar Stationary phase (chemistry), stationary phase and polar mobile phases are used for the separation of organic compounds. The vast majority of separat ...

column * IEC 60320 C18, a power connector *

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) * ISO/IEC 9899:2018 standard for the programming language C, informally named C18

Transportation and military

* HMS ''C18'', a submarine * Sauber C18, a Formula One racing car *

Chrysler Royal The Chrysler Royal was a full-size car produced by the Chrysler Corporation in the United States. It was first released in 1933 and continued being built until 1934. Then, the model ended production and did not return until 1937, and then cont ...

C18, a 1938 car * The C-18, a military cargo version of the Boeing

C-137 Stratoliner The Boeing C-137 Stratoliner is a retired VIP Cargo aircraft, transport aircraft derived from the Boeing 707 jet airliner used by the United States Air Force. List of Boeing 707 operators, Other nations also bought both new and used 707s for mili ...

Other uses

French Defence The French Defence is a chess opening characterised by the moves: :1. e4 e6 This is most commonly followed by 2.d4 d5. Black usually plays ...c5 soon after, attacking White's and gaining on the . The French has a reputation for solidity ...

(Encyclopaedia of Chess Openings code) *

Combat 18 Combat 18 (C18 or 318) is a neo-Nazi terrorist organisation that was founded in 1992. It originated in the United Kingdom with ties to movements in Canada and the United States. Since then, it has spread to other countries, including Germany. C ...

, a British neo-Nazi organization *

18th century The 18th century lasted from 1 January 1701 (represented by the Roman numerals MDCCI) to 31 December 1800 (MDCCC). During the 18th century, elements of Enlightenment thinking culminated in the Atlantic Revolutions. Revolutions began to ch ...

(1701–1800 AD) *

Android 18 is a fictional character in the '' Dragon Ball'' manga series created by Akira Toriyama. Android 18 makes her debut in Chapter #349 "The Androids Awake!", first published in ''Weekly Shōnen Jump'' on November 12, 1991. She and her twin brother, ...

, character from

Dragon Ball is a Japanese media franchise created by Akira Toriyama in 1984. The Dragon Ball (manga), initial manga, written and illustrated by Toriyama, was Serial (literature), serialized in ''Weekly Shōnen Jump'' from 1984 to 1995, with the 519 indi ...

Franchise * Bill C-18, Canada's

Online News Act The ''Online News Act'' (), known commonly as Bill C-18, is a Canadian federal statute. Introduced in the 44th Canadian Parliament, passed by the Senate on June 15, 2023, and receiving royal assent on June 22, 2023, the act will implement a fram ...

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