| Acronym | Meaning |
 | AOW | Advanced Open Water |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| BT | Bottom Time |
| LP | Low Pressure |
| NAUI | National Association Of Underwater Instructors |
| DPV | Diver Propulsion Vehicle |
| DIN | Deutsches Insitut Fuer Normung |
| RYA | Royal Yachting Association |
| AAS | Alternate Air Source |
| AIC | Advanced Instructor Course (BSAC) |
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