| Acronym | Meaning |
 | CNS | Central Nervous System |
| AIE | Advanced Instructor Exam (BSAC) |
| BHA | British Hyperbaric Association |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| ATA | Atmospheres Absolute |
| PPB | Peak Performance Bouyancy |
| GMDSS | Global Maritime Distress And Safety System |
| RD | Rescue Diver (PADI) |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| IDC | Instructor Development Course (PADI) |
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