CK, Ck, or ck may refer to:

Science and technology

Conductive keratoplasty Conductive keratoplasty (CK) is a type of refractive surgery that uses radio waves to adjust the contour of the cornea by shrinking the corneal collagen around it. It is used to treat mild to moderate hyperopia. It is a non-invasive alternative to ...

, 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 China Cargo Airlines () sometimes as abbreviated 中货航 (in English as ''CCA'') is a cargo airline with its head office on Hongqiao International Airport in Shanghai, People's Republic of China. It is China's first all-cargo airline operating ...

(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. Louis Alfred Székely (; born September 12, 1967), known professionally as Louis C.K. (), is an American stand-up comedian, screenwriter, actor, and filmmaker. C.K. won three Peabody Awards, three Grammy Awards, six Primetime Emmy Awards, and a ...

(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 Civil Code of the Republic of Lithuania () is the Civil Code of Lithuania. It came into effect on 1 July 2001,Core Knowledge Core Knowledge (CK) refers to a current textbook series originally written by a collective of former top Year 12 South Australian students of the same name (2003–2008) for South Australian Certificate of Education (SACE) students. The Core Kno ...

, 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 ...