| Acronym | Meaning |
 | CCR | Closed Circuit Rebreather |
| ITC | Instructor Training Course (BSAC) |
| DEMA | Diving Equipment Manufacturers Association |
| HID | High Intensity Discharge |
| EAR | Expired Air Resuscitation |
| ABT | Actual Bottom Time |
| OWIC | Open Water Instructor Course (BSAC) |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| CNS | Central Nervous System |
| RYA | Royal Yachting Association |
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