| Acronym | Meaning |
 | RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| TO | Training Officer (BSAC) |
| DO | Dive Officer (BSAC) |
| CNS | Central Nervous System |
| BHA | British Hyperbaric Association |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| MSD | Master SCUBA Diver (PADI) |
| RNT | Residual Nitrogen Time |
| NI | National Instructor (BSAC) |
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