| Acronym | Meaning |
 | MSD | Master SCUBA Diver (PADI) |
| DEMA | Diving Equipment Manufacturers Association |
| CCR | Closed Circuit Rebreather |
| OW(D) | Open Water (Diver) (PADI) |
| TDT | Total Dive Time |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| BWRAF | Buoyancy |
| LP | Low Pressure |
| IAND | International Association Of Nitrox Divers |
| TP | Test Pressure |
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