| Acronym | Meaning |
 | AIC | Advanced Instructor Course (BSAC) |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| IDC | Instructor Development Course (PADI) |
| CCR | Closed Circuit Rebreather |
| BC | Bouyancy Compensator |
| DIN | Deutsches Insitut Fuer Normung |
| TDT | Total Dive Time |
| BWRAF | Buoyancy |
| AMDT | Adjusted Maximum Dive Time |
| ATA | Atmospheres Absolute |
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