Other
- Ace-King, a card combination in Poker
- AirAsia, IATA code for the Malaysia-based airline
- Akan language, ISO 639 alpha-2
- American kestrel, in falconers' usage, a species of bird of prey
- Attokelvin, an SI unit of temperature
- Knight of the Order of Australia, a chivalric award, defunct since 1986
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