| Acronym | Meaning |
 | IAND | International Association Of Nitrox Divers |
| MCA | Maritime And Coastguard Agency |
| BWRAF | Buoyancy |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| AIE | Advanced Instructor Exam (BSAC) |
| EAN(X) | Enriched Air Nitrox |
| PP | Partial Pressure |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| DV | Demand Valve |
| PG | Pressure Group |
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