| Acronym | Meaning |
| CTIL | Critical Tracked Items List |
| NRU | Nauru (ISO 3166 Trigram) |
| PIB | PolyIsoButylene |
| AAS | Advanced Automation System - American Astronomical Society (double-A-S) |
| USAF | United States Air Force |
| LTC | Lieutenant-Colonel (U.S.) |
| RW | Kinyarwanda Language (ISO 639-1 Code) |
| GC | East Germany (NATO Country Code; Obsolete 1990) -General Counsel -Gigacoulomb |
| LV | Latvian Language (ISO 639-1 Code) |
| GI | Gibi |