| Acronym | Meaning |
| OA | Operational Analysis |
| OTEA | (U.S. Army) Operational Test Evaluation Agency |
| MATS | U.S. Military Air Transport Service (1948-1966) |
| SEP | Somebody Else's Problem - Spherical Error Probable - System Enhancement Package - System Engineering Plan |
| ESO | European Southern Observatory |
| LIN | Lingala Language (ISO 639-2 Code) |
| JZ | Joint Zone |
| USFL | United States Football League |
| KOR | Korean Language (ISO 639-2 Code) |
| URL | Uniform Resource Locator (earl) |