| Acronym | Meaning |
| DRIC | (U.S.) Defense Research Information Center |
| ICO | Intermediate Circular Orbit |
| PWL | PieceWise Linear (describing A Mathematical Function) |
| FA | Femtoampere |
| NT | Iraq-Saudi Arabia Neutral Zone (ISO 3166 Digram; Obsolete 1993) - Northern Territory (Australia) (postal Symbol) - Northwest Territories (Canada) (postal Symbol) - National Trust (UK) |
| NAFTA | North American Free Trade Agreement |
| LVA | Latvia (ISO 3166 Trigram) |
| VR | Virtual Reality |
| PDD | Past Due Date - Presidential Decision Directive |
| IRAS | Infrared Astronomical Satellite |