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 Creatine kinase (CK), also known as creatine phosphokinase (CPK) or phosphocreatine kinase, is an enzyme () expressed by various tissues and cell types. CK catalyses the conversion of creatine and uses adenosine triphosphate (ATP) to create phosp ...

, an enzyme *

Cytokinin Cytokinins (CK) are a class of plant hormones that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and lea ...

, a plant hormone *

Cytokeratin Cytokeratins are keratin proteins found in the intracytoplasmic cytoskeleton of epithelial tissue. They are an important component of intermediate filaments, which help cells resist mechanical stress. Expression of these cytokeratins within epit ...

(CK1 to CK20), keratin proteins *

Cyanogen chloride Cyanogen chloride is a highly toxic chemical compound with the formula CNCl. This linear, triatomic pseudohalogen is an easily condensed colorless gas. More commonly encountered in the laboratory is the related compound cyanogen bromide, a room-tem ...

, 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) The Collective Knowledge (CK) project is an open-source framework and repository to enable collaborative, reproducible and sustainable research and development of complex computational systems. CK is a small, portable, customizable and decentral ...

, 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 Chowking () is a Chinese cuisine fast food restaurant selling mostly noodle soups, dim sum and rice bowls. Its headquarters in the Philippines. After Jollibee Foods Corporation (JFC) acquired Chowking in 2000, the brand was placed under Fres ...

, a Filipino fast food chain *

Colombo Kings Colombo Stars, formerly known as Colombo Kings, is a franchise Twenty20 cricket team based in Colombo, Sri Lanka, that competes in the Lanka Premier League. Ashoka Pathirage, a Sri Lankan businessman, owns the team. The team was supposed to b ...

, a team participating in Lanka Premier League *

CK Hutchison Holdings CK Hutchison Holdings Limited is a Hong Kong-based and Cayman Islands-registered multinational conglomerate corporation. The company was formed in March 2015 through the merger of Cheung Kong Holdings and its main associate company Hutchison Wh ...

, a multinational conglomerate headquartered in Hong Kong *

Bloods The Bloods are a primarily African-American street gang founded in Los Angeles, California. The gang is widely known for its rivalry with the Crips. It is identified by the red color worn by its members and by particular gang symbols, includin ...

, a US-based street gang, from the nickname "Crip Killer" *

Circle K Circle K Stores, Inc. is a Canadian chain of convenience stores headquartered in Laval, Quebec, Canada. It is owned by the multinational company Couche-Tard. Founded in 1951 in El Paso, Texas, the company filed for bankruptcy protection in 1 ...

, 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 A graphical representation of a Design Process using C-K Design Theory. C-K design theory or concept-knowledge theory is both a design theory and a theory of reasoning in design. It defines design reasoning as a logic of expansion processes, ''i ...

(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 ...