| Acronym | Meaning |
 | NAUI | National Association Of Underwater Instructors |
| EAN(X) | Enriched Air Nitrox |
| CNS | Central Nervous System |
| CAGE | Cerebral Arterial Gas Embolism |
| DCAP | Decompression Computation And Analysis Program |
| RYA | Royal Yachting Association |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| AAS | Alternate Air Source |
| OW(D) | Open Water (Diver) (PADI) |
| DPV | Diver Propulsion Vehicle |
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