4K, 4-K or 4k may refer to: *

4000 (number) 4000 (four thousand) is the natural number following 3999 and preceding 4001. It is a decagonal number. Selected numbers in the range 4001–4999 4001 to 4099 * 4005 – triangular number * 4007 – safe prime * 4010 – magic constant of ''n ...

* Four kibibytes (4 × 1024 bytes, better written 4 KiB) ** 4K

disk sector In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. Each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs) and 2048 bytes for CD-ROMs and ...

size (

Advanced Format Advanced Format (AF) is any disk sector format used to store data on magnetic disks in hard disk drives (HDDs) that exceeds 512, 520, or 528 bytes per sector, such as the 4096, 4112, 4160, and 4224-byte (4 KB) sectors of an Advanced Format ...

) ** 4K demoscene compo, a computer art competition using programs limited to 4 kibibytes ** The Java 4K Game Programming Contest *

4K resolution 4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 38402160 (4K UHD) is the domina ...

, a collective term for digital video formats having a horizontal resolution of approximately 4,000 pixels ** 4K UHDTV, an

ultra-high-definition television Ultra-high-definition television (also known as Ultra HD television, Ultra HD, UHDTV, UHD and Super Hi-Vision) today includes 4K UHD and 8K UHD, which are two digital video formats with an aspect ratio of 16:9. These were first proposed by ...

format * 4K, the IATA airline code for Askari Aviation * 4K, an alternative name for Cuatro Cabezas (''Four Heads''), an Argentine multimedia production company. * 4K, model of

Toyota K engine The Toyota K series is an inline-four engine that was produced from 1966 through 2007. It is a two-valve pushrod engine design. It was originally built from the Toyota Kamigo plant in Toyota City factory in Japan. All K series are non-crossf ...

* 4K, the production code for the 1976 ''Doctor Who'' serial ''

The Brain of Morbius ''The Brain of Morbius'' is the fifth serial of the 13th season of the British science fiction television series ''Doctor Who'', which was first broadcast in four weekly parts on BBC1 from 3 to 24 January 1976. The screenwriter credit is give ...

See also