| Acronym | Meaning |
 | TNT | Total Nitrogen Time |
| AIC | Advanced Instructor Course (BSAC) |
| HPNS | High Pressure Nervous Syndrome |
| ADT | Actual Dive Time |
| MDL | No Decompression Limit |
| BHA | British Hyperbaric Association |
| OWIC | Open Water Instructor Course (BSAC) |
| AOW | Advanced Open Water |
| MSD | Master SCUBA Diver (PADI) |
| CCR | Closed Circuit Rebreather |
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