| Acronym | Meaning |
 | CMAS | Confederation Moniale Des Activities Subaquatiques |
| EFR | Emergency First Response |
| RNT | Residual Nitrogen Time |
| CESA | Controlled Emergency Swimming Ascent |
| OWIC | Open Water Instructor Course (BSAC) |
| CCR | Closed Circuit Rebreather |
| DIR | Doing It Right |
| BWRAF | Buoyancy |
| NI | National Instructor (BSAC) |
| DL | Dive Leader (BSAC) |
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