| Acronym | Meaning |
| RHU | Replacement Holding Unit |
| ND | Neodymium |
| MODSAF | Modular Semi-Automated Forces (military Simulation) |
| A/D | Analog/Digital |
| LLAD | Low Level Air Defence |
| YM | Yoctometre |
| LUCA | Last Universal Common Ancestor |
| MHHW | Mean Higher High Water (nautical Charts) |
| AFRRI | (U.S.) Armed Forces Radiobiology Research Institute |
| SCRAM | Safety Control Rod Axe Man |