| Acronym | Meaning |
 | IAND | International Association Of Nitrox Divers |
| BHA | British Hyperbaric Association |
| DEMA | Diving Equipment Manufacturers Association |
| OD | Ocean Diver (BSAC) |
| TP | Test Pressure |
| DCI | Decompression Illness |
| IOC | Instructor Orientation Course (PADI) |
| HSE | Health And Safety Executive |
| EAR | Expired Air Resuscitation |
| LAT | Lowest Astonomical Tide |
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