| Acronym | Meaning |
 | BHA | British Hyperbaric Association |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| MCS | Marine Conservation Society |
| NI | National Instructor (BSAC) |
| VGE | Venous Gas Embolism |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| DCI | Decompression Illness |
| DPV | Diver Propulsion Vehicle |
| CCR | Closed Circuit Rebreather |
| RD | Rescue Diver (PADI) |
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