| Acronym | Meaning |
 | NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| LP | Low Pressure |
| NAUI | National Association Of Underwater Instructors |
| CAGE | Cerebral Arterial Gas Embolism |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| OW(D) | Open Water (Diver) (PADI) |
| TNT | Total Nitrogen Time |
| CESA | Controlled Emergency Swimming Ascent |
| NI | National Instructor (BSAC) |
| CNS | Central Nervous System |
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