| Acronym | Meaning |
 | BHA | British Hyperbaric Association |
| PADI | Professional Association Of Diving Instructors |
| END | Equivalent Narcotic Depth |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| DAN | Divers Alert Network |
| TP | Test Pressure |
| AIC | Advanced Instructor Course (BSAC) |
| BCD | Buoyancy Control Device |
| OWSI | Open Water SCUBA Instructor (PADI) |
| TNT | Total Nitrogen Time |
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