| Acronym | Meaning |
| USNO | U.S. Naval Observatory |
| UUV | Unmanned Underwater Vehicle |
| NC3A OR NC?A | NATO Consultation |
| PGD | Pre-implantation Genetic Diagnosis |
| CRAM | Combined Radiometric Correction Model |
| HVO | Upper Volta (ISO 3166 Trigram; Obsolete 1984) |
| PITA | Pain In The Ass |
| JV | Joint Venture - Junior Varsity |
| EID | Electronic ID |
| PPQN | Pulses Per Quarter Note (ditto) |