| Acronym | Meaning |
 | NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
 | PPB | Peak Performance Bouyancy |
 | OWIC | Open Water Instructor Course (BSAC) |
 | ITW | Instructor Training Workshop (BSAC) |
 | SCUBA | Self Contained Underwater Breathing Aparatus |
 | DO | Dive Officer (BSAC) |
 | IOC | Instructor Orientation Course (PADI) |
 | BT | Bottom Time |
 | HSE | Health And Safety Executive |
 | CAGE | Cerebral Arterial Gas Embolism |