4K

4K has several uses including:

* A temperature of 4 kelvin
* 4000, the number
* As a category in demoscene compos
* 4K digital film standard resolutions, see List of common resolutions.
* Askari Aviation IATA code
* The Java 4K Game Programming Contest
* 4K - Cuatro Cabezas Multimedia Production Company
* The Fourth Republic