C18 may refer to:

Science and technology

* Caldwell 18 ( NGC 185), a dwarf spheroidal galaxy of the Local Group in the constellation Cassiopeia *

Carbon-18 Carbon (6C) has 15 known isotopes, from to , of which and are stable. The longest-lived radioisotope is , with a half-life of years. This is also the only carbon radioisotope found in nature—trace quantities are formed cosmogenically by ...

(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, particularly in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated or unsaturated. Most naturally occurring fatty acids have an unbranched chain of an even number of carbon atoms, ...

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 waxy solid and its chemical formula is C17H35CO2H. Its name comes from the Greek word στέαρ "''stéar''", which means tall ...

, 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. In chemical terms, oleic acid is classified as a monounsaturated om ...

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

reversed-phase chromatography Reversed-phase chromatography (also called RPC, reverse-phase chromatography, or hydrophobic chromatography) includes any chromatographic method that uses a hydrophobic stationary phase. RPC refers to liquid (rather than gas) chromatography. S ...

column *

IEC 60320 C18 IEC 60320 Appliance couplers for household and similar general purposes is a set of standards from the International Electrotechnical Commission (IEC) specifying non-locking connectors for connecting power supply cords to electrical appliances o ...

, a power connector * Colorectal cancer (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 The Sauber C18 was the car with which the Sauber team competed in the 1999 Formula One World Championship. It was driven by Frenchman Jean Alesi, in his second year with the team, and Brazilian Pedro Diniz, who joined from Arrows. Design and ...

, a Formula One racing car *

Chrysler Royal Chrysler Eight For production year 1931, Chrysler introduced their first straight eight engine for the Chrysler Imperial, and offered it in the Chrysler Eight Series CD. It borrowed appearance influences from the Cord L-29. The engine used had ...

C18, a 1938 car * The C-18, a military cargo version of the Boeing C-137 Stratoliner

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, with Black intending ...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. ...

, a British neo-Nazi organization *

18th century The 18th century lasted from January 1, 1701 ( MDCCI) to December 31, 1800 ( MDCCC). During the 18th century, elements of Enlightenment thinking culminated in the American, French, and Haitian Revolutions. During the century, slave tradin ...

(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 Franchise {{Letter-NumberCombDisambig