CK, Ck, or ck may refer to:

Science and technology

* Conductive keratoplasty, a type of refractive surgery * Creatine kinase, an enzyme * Cytokinin, a plant hormone * Cytokeratin (CK1 to CK20), keratin proteins * Cyanogen chloride, an inorganic chemical

Computing

.ck .ck is the Internet country code top-level domain (ccTLD) for the Cook Islands. Registrations are within these second-level categories: * .co.ck: business organizations * .org.ck: not-for-profit organizations * .edu.ck: educational institutions * ...

, the Internet country code top-level domain for the Cook Islands * Collective Knowledge (software), a framework for collaborative and reproducible research

Organizations

Calvin Klein Calvin Richard Klein (born November 19, 1942) is an American fashion designer who launched the company that would later become Calvin Klein Inc., in 1968. In addition to clothing, he also has given his name to a range of perfumes, watches, and ...

, a fashion company * Chowking, a Filipino fast food chain * Colombo Kings, a team participating in Lanka Premier League * CK Hutchison Holdings, a multinational conglomerate headquartered in Hong Kong * Bloods, a US-based street gang, from the nickname "Crip Killer" * Circle K, an international chain of convenience stores

Transportation

* China Cargo Airlines (IATA code CK) *

Composite Corridor The Composite Corridor (or CK) is a railway coach with a number of compartments, some of which are standard class (previously second, né third class) and some first class, linked by a side corridor. History The composite coach was a standar ...

, a designation of British Rail carriages *

Chevrolet C/K C/K is a series of trucks that was manufactured by General Motors from the 1960 to 2002 model years. Marketed by both the Chevrolet and GMC divisions, the C/K series encompassed a wide range of vehicles. While most commonly associated with picku ...

, a model of pickup truck

People

* Louis C.K. (born 1967), American comedian *

Con Kolivas Con Kolivas is an Australian anaesthetist.Anaesthesia Information Page
by Kolivas, Jan 2001 He ...

, Australian anaesthetist

Other uses

* ''ck'' (digraph), a letter combination used in spelling * C-K theory (concept-knowledge theory), in design * ''CK'' (album), a 1988 album by Chaka Khan * Civilinis kodeksas, the Code of Lithuania * Core Knowledge, a textbook series *

Cranbrook Kingswood Cranbrook Schools is a private, PK–12 preparatory school located on a campus in Bloomfield Hills, Michigan. The schools comprise a co-educational elementary school, a middle school with separate schools for boys and girls, and a co-education ...