| Acronym | Meaning |
 | IDEA | International Diving Educators Association; Diving Instruction Organization. |
| BC | Bouyancy Compensator |
| END | Equivalent Narcotic Depth |
| ITW | Instructor Training Workshop (BSAC) |
| HP | High Pressure |
| DV | Demand Valve |
| RD | Rescue Diver (PADI) |
| CESA | Controlled Emergency Swimming Ascent |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| PG | Pressure Group |
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