| Acronym | Meaning |
| OMN | Oman (ISO 3166 Trigram) |
| RSN | Real Soon Now (coined By Author Jerry Pournelle) |
| ARL | UK Admiralty Research Laboratory (1921?1977) - U.S. Army Research Laboratory - UIUC Aviation Research Laboratory |
| DRAGN | Double Radio Source Active Galactic Nucleus (dragon) |
| ADA | Air Defence Artillery - American Dental Association - Assistant District Attorney - Americans With Disabilities Act (see Also The Similar But Non-acronymic Ada Programming Language) |
| BRA | Brazil (ISO 3166 Trigram) |
| ABCS | (U.S.) Army Battle Command System |
| NC | Nanocoulomb |
| SARP | Search And Rescue Processor |
| BSF | British Standard Fine (screw Thread) |