| Acronym | Meaning |
 | EAR | Expired Air Resuscitation |
| EO | Equipment Officer (BSAC) |
| BT | Bottom Time |
| MDT | Maximum Dive Time |
| OWIC | Open Water Instructor Course (BSAC) |
| DAN | Divers Alert Network |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| TNT | Total Nitrogen Time |
| DIN | Deutsches Insitut Fuer Normung |
| PPB | Peak Performance Bouyancy |
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