| Acronym | Meaning |
 | BHA | British Hyperbaric Association |
| CNS | Central Nervous System |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| MCS | Marine Conservation Society |
| END | Equivalent Narcotic Depth |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| NI | National Instructor (BSAC) |
| EAN(X) | Enriched Air Nitrox |
| GPS | Global Positioing System |
| IAND | International Association Of Nitrox Divers |
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