| Acronym | Meaning |
 | BT | Bottom Time |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| MCA | Maritime And Coastguard Agency |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| BHA | British Hyperbaric Association |
| ITS | Instructor Training Scheme (BSAC) |
| SI | Surface Interval |
| ITW | Instructor Training Workshop (BSAC) |
| PP | Partial Pressure |
| END | Equivalent Narcotic Depth |
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