| Acronym | Meaning |
 | ORR | Oak Ridge Reservation (U.S. DOE) - Office Of Rail Regulation (UK Government) - Office Of Refugee Resettlement - (CIA) Office Of Research And Reports - Operational Readiness Rate - Operational Readiness Review |
| TBD | To Be Determined |
| AASPEM | Advanced Air-to-air System Performance Evaluation Model |
| ADI | Acceptable/Allowable Daily Intake |
| URD | Urdu Language (ISO 639-2 Code) |
| B?C | Blue ?yster Cult |
| GD | Grenada (ISO 3166 Digram) |
| SW | South-West - Sweden (FIPS 10-4 Country Code) |
| CTC | Closed Timelike Curve (relativity) - (U.S.) Combat Training Center |
| PPQT | Pre-Production Qualification Test |
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