| Acronym | Meaning |
 | DIR | Doing It Right |
| IAND | International Association Of Nitrox Divers |
| MCS | Marine Conservation Society |
| HSE | Health And Safety Executive |
| RD | Rescue Diver (PADI) |
| IDC | Instructor Development Course (PADI) |
| LP | Low Pressure |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| PP | Partial Pressure |
| AMDT | Adjusted Maximum Dive Time |
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