| Acronym | Meaning |
| GU | Guam (postal Symbol; ISO 3166 Digram) |
| RDO | Rapid |
| NA | Namibia (ISO 3166 Digram) -National Archives - Negative Acknowledge |
| ROV | Remotely Operated Vehicle |
| R&R | Rest & Relaxation |
| ZAF | South Africa (ISO 3166 Trigram) |
| CADCAM | Computer-Aided Design/Computer-Aided Manufacturing |
| EMCON | (Electromagnetic) Emissions Control |
| NT | Nanotesla |
| NWRA | National Wildlife Rehabilitators Association |