| Acronym | Meaning |
 | BHA | British Hyperbaric Association |
| EFR | Emergency First Response |
| BCD | Buoyancy Control Device |
| OD | Ocean Diver (BSAC) |
| OWIC | Open Water Instructor Course (BSAC) |
| MSD | Master SCUBA Diver (PADI) |
| DCS | Decompression Sickness |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| IDC | Instructor Development Course (PADI) |
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