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4K, 4-K or 4k may refer to:
- 4000 (number)
- Four kibibytes (4 × 1024 bytes, better written 4 Kib)
- 4K resolution, a collective term for digital video formats having a horizontal resolution of approximately 4,000 pixels
- 4K UHDTV, a high-resolution TV format
- A temperature of 4 kelvins (better written as 4 K)
- 4K, the IATA airline code for Askari Aviation
- 4K, an alternative name for Cuatro Cabezas (Four Heads), an Argentine multimedia production company
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