| Acronym | Meaning |
 | IET | Initial Entry Training |
| SSA | Cargo Submarine (US Navy Hull Classification) |
| HFE | Human Fertilisation And Embryology (UK Act) |
| PLUTO | Pipe Line Under The Ocean |
| RCT | Randomized Controlled Trial - Robotically Controlled Telescope |
| RA | Rain (METAR Code) -Rear Area - Reinforced Alert - Republican Army - Right Ascension - Royal Artillery (UK) - Royal Academy |
| UHRB | Ultra-High Resolution Building (simulation) |
| UPF | Universitat Pompeu Fabra (Catalan |
| RCRA | Resource Conservation And Recovery Act (reck-ra Or Rick-ra) |
| ISR | Intelligence |
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