Other
- Kilojoule (kJ), an International System of Units unit of energy equal to 1000 joules
- KJ, IATA code for British Mediterranean Airways
- KJ, model code for Jeep Liberty
- Karaoke jockey, a disk jockey who specializes in running karaoke performances
- Nickname for Kiryas Joel, a village in Monroe, Orange County, New York, USA
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