| Acronym | Meaning |
| XII | Twelve (in Roman Numerals) |
| RACK | Risk Aware Consensual Kink (SM Phrase) |
| AAR | After-Action Review - Association Of American Railroads |
| IRST | Infra-red Search And Track |
| ART | Adaptive Resonance Theory - Anti-Retroviral Therapy |
| SHAC | Stop Huntingdon Animal Cruelty |
| RX | Medical Prescription (possibly From Latin Recipere |
| HL | Holding Line |
| JDEM | Joint Dark Energy Mission |
| RWR | Radar Warning Receiver |