| Acronym | Meaning |
 | SCAP | Supreme Commander Allied Powers (Allied Occupation Of Japan) |
| USNO | U.S. Naval Observatory |
| ATB | Active Time Battle -British Antarctic Territory (ISO 3166 Trigram; Merged With AQ In 1979) |
| MR | Mauritania (FIPS 10-4 Country Code; ISO 3166 Digram) |
| DZA | Algeria (ISO 3166 Trigram) |
| WTH | What The Hell |
| NICAP | National Investigations Committee On Aerial Phenomena |
| SARR | Search And Rescue Repeater |
| RPM | Red Hat Package Manager |
| JEFX | Joint Expeditionary Force EXperiment |
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