| Acronym | Meaning |
 | END | Equivalent Narcotic Depth |
| BWRAF | Buoyancy |
| DL | Dive Leader (BSAC) |
| PPB | Peak Performance Bouyancy |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| PG | Pressure Group |
| DIR | Doing It Right |
| RD | Rescue Diver (PADI) |
| CCR | Closed Circuit Rebreather |
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