| Acronym | Meaning |
 | PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| CAGE | Cerebral Arterial Gas Embolism |
| TO | Training Officer (BSAC) |
| OD | Ocean Diver (BSAC) |
| PPB | Peak Performance Bouyancy |
| CNS | Central Nervous System |
| BC | Bouyancy Compensator |
| AAS | Alternate Air Source |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| ITW | Instructor Training Workshop (BSAC) |
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