| Acronym | Meaning |
 | OWI | Open Water Instructor (BSAC) |
| OWSI | Open Water SCUBA Instructor (PADI) |
| PG | Pressure Group |
| MSD | Master SCUBA Diver (PADI) |
| CNS | Central Nervous System |
| PPB | Peak Performance Bouyancy |
| BT | Bottom Time |
| TDT | Total Dive Time |
| IOC | Instructor Orientation Course (PADI) |
| ATA | Atmospheres Absolute |
Browse by Letter:
