| Acronym | Meaning |
 | ATA | Atmospheres Absolute |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| DL | Dive Leader (BSAC) |
| OD | Ocean Diver (BSAC) |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| IOC | Instructor Orientation Course (PADI) |
| DV | Demand Valve |
| TO | Training Officer (BSAC) |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| ITC | Instructor Training Course (BSAC) |
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