| Acronym | Meaning |
 | ITC | Instructor Training Course (BSAC) |
| HID | High Intensity Discharge |
| DSMB | Delayed Surface Marker Buoy |
| MDT | Maximum Dive Time |
| BC | Bouyancy Compensator |
| DCS | Decompression Sickness |
| DEMA | Diving Equipment Manufacturers Association |
| AOW | Advanced Open Water |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| OW(D) | Open Water (Diver) (PADI) |
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