| Acronym | Meaning |
 | EAN(X) | Enriched Air Nitrox |
| DEMA | Diving Equipment Manufacturers Association |
| PSI | Pounds Per Square Inch |
| RDP | Recreational Dive Planner |
| DPV | Diver Propulsion Vehicle |
| AA | Assisted Ascent |
| IOC | Instructor Orientation Course (PADI) |
| PPB | Peak Performance Bouyancy |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| DV | Demand Valve |
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