Chiang Kai-shek, was a Chinese military and political leader.

Commander Keen, a series of games for MS DOS.

Calvin Klein.

Cranbrook Kingswood, the affectionately used nickname for the Bloomfield Hills school.

Chicago Kent College of Law, Chicago, Illinois.

Creatine kinase.

China Cargo Airlines, IATA code.

Crystal Kay.

Crusader Kings, a grand strategy game.

Crip Killer, a designation used by the Bloods, a notorious street gang.

Cytokinin, a kind of plant hormone.

Conductive keratoplasty.

Carlo Kopp. Prominent Australian freelance defence analyst and iconic university academic.

Core Knowledge, a collective of former top Year 12 students from South Australia producing subject guides for Year 12

Cocos (Keeling) Islands, FIPS Pub 10-4 and obsolete NATO digram.

Composite Corridor, a designation of British Rail carriage.

Con Kolivas, the Linux Kernel developer.

Cook Islands, ISO 3166-1 digram.

Ck, a digraph

in mathematics, the class C^k of smooth functions that are k-times continuously differentiable