| Acronym | Meaning |
| B[A]P | Benzo[a]pyrene |
| G24 | Group Of 24 (subset Of G77 |
| EGRET | Energetic Gamma-Ray Experiment Telescope |
| PCZ | Panama Canal Zone (ISO 3166 Trigram; Obsolete 1980) |
| ATN | Dronning Maud Land (ISO 3166 Trigram; Merged With AQ In 1983) |
| RE | Rhenium |
| IEA | International Energy Agency |
| CAT | Community Acceptance Testing - Computer-Assisted (or Axial) Tomography |
| FTE | Full Time Equivalent |
| RAP | Radio Access Point - Radiological Assistance Program (U.S. Department Of Energy) - Rear Area Protection - Recognised [Operating/Operational] Air Picture - Recurring Advance Payment - Relational Associative Processor - Reliable Acoustic Path - Rocket-Assis |