| Acronym | Meaning |
 | RPN | Reverse Polish Notation |
| FJ | Fiji (ISO 3166 Digram; FIPS 10-4 Country Code) |
| ABM | Anti-Ballistic Missile - Asynchronous Balanced Mode - Automated Banking Machine |
| PJ | Petajoule |
| IDO | Ido Language (ISO 639-2 Code) |
| GIF | Graphics Interchange Format (pronounced Jif) |
| AT | Astatine |
| BBB | Better Business Bureau - Blood-Brain Barrier |
| CSA | Canadian Space Agency - Canadian Standards Association - Child Support Agency - Command Staff Advisor - Community-supported Agriculture - Confederate States Of America - Corps Storage Area -Czech Airlines |
| NORTHAG | Northern Army Group |
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