| Acronym | Meaning |
| MTC | Main Trunk Circuit |
| IFIAS | International Federation Of Institutes For Advanced Study |
| CAPS | Center For The Analysis And Prediction Of Storms |
| GNU | GNU's Not UNIX (a Recursive Acronym) |
| UI | Unit Of Issue |
| ICH | Inter-Union Commission On The Lithosphere |
| BPS | Bits Per Second |
| ACEP | DOC Advisory Committee |
| MAB | Meteorological Applications Branch |
| ADS | Airborne Data System |