| Acronym | Meaning |
| OHP | Observatoire De Haute-Provence |
| USS | United States Ship (sometimes Meaningless; See Star Trek) |
| PGH | Pre-implantation Genetic Haplotyping |
| NAVSPASUR | U.S. Naval Space Surveillance System |
| AMSO | U.S. Army Model And Simulation Office |
| SAARC | South Asian Association For Regional Cooperation |
| BN | Brunei (ISO 3166 Digram; FIPS 10-4 Country Code) |
| MS | Megasecond |
| LSO | Lesotho (ISO 3166 Trigram) |
| IMU | International Mathematical Union |