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 ...

, 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 phos ...

, 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 (biology), cell growth and cellular differentiation, differentiation, but also affect apical ...

, 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 ep ...

(CK1 to CK20), keratin proteins *

Cyanogen chloride Cyanogen chloride is an inorganic compound with the formula . This triatomic pseudohalogen is an easily condensed colorless gas. More commonly encountered in the laboratory is the related compound cyanogen bromide, a room-temperature solid that is ...

, an inorganic chemical

Computing

.ck .ck is the Internet country code top-level domain (ccTLD) for the Cook Islands. Registration Registrations are within these second-level categories: Requirements Pre-requisites for applying for a domain is as follows: # Non-resident domain ...

, 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. In 1968, he launched the company that later became Calvin Klein. In addition to clothing, he has also given his name to a range of perfumes, watches, and jewellery. ...

, a fashion company * Chowking, a Filipino fast food chain * Colombo Kings, 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 Hutc ...

, a multinational conglomerate headquartered in Hong Kong *

Bloods The Bloods are a primarily African Americans, African American street gang which was founded in Los Angeles, California. The gang is widely known for Crips–Bloods gang war, its rivalry with the Crips. It is identified by the red color worn ...

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

Circle K Circle K Stores, Inc. is a Canadian-American chain of convenience stores headquartered in Tempe, Arizona, and owned by Alimentation Couche-Tard, Alimentation Couche-Tard, Inc., based in Laval, Quebec. Founded in 1951 in El Paso, Texas, the comp ...

, an international chain of convenience stores

Transportation

* China Cargo Airlines (IATA code CK) * Composite Corridor, a designation of British Rail carriages * Chevrolet C/K, a model of pickup truck

People

* Louis C.K. (born 1967), American comedian * Con Kolivas, Australian anaesthetist

Other uses