| Acronym | Meaning |
 | SPG | Submerssible Pressure Guage |
| END | Equivalent Narcotic Depth |
| TO | Training Officer (BSAC) |
| EAN(X) | Enriched Air Nitrox |
| MCA | Maritime And Coastguard Agency |
| EFR | Emergency First Response |
| NI | National Instructor (BSAC) |
| DIN | Deutsches Insitut Fuer Normung |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| BHA | British Hyperbaric Association |
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