| Acronym | Meaning |
 | AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| AA | Assisted Ascent |
| OD | Ocean Diver (BSAC) |
| BWRAF | Buoyancy |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| DM | Dive Master (PADI) |
| CESA | Controlled Emergency Swimming Ascent |
| PSI | Pounds Per Square Inch |
| CCR | Closed Circuit Rebreather |
| DIN | Deutsches Insitut Fuer Normung |
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