| Abbreviation | Definition |
|---|---|
| JPA | Joint Parliamentary Assembly |
| JPA | Jump when Pizza Arrives |
| JPE | Jump If Parity Even |
| JPO | Jump If Parity Odd |
| JR | Jump Register |
| JR | Jump Relative |
| JR | Justification Right |
| JRSR | Jump to Random Subroutine |
| JS | Join Similar |
| JS | Jump If Sign |
| JSR | Jump To Sub Routine |
| JZ | Jump If Zero |
| JZP | Jump on Zero Parity |
| KA | Keep All |
| KAPS | Kitchen Assembly Production System |
| KBA | Kiamichi Baptist Assembly |
| KIA | Killed In Assembly |
| KSR | Keyboard Shift Right |
| KUD | Kill User Data |
| L | List |