| Acronym | Meaning |
 | MSD | Master SCUBA Diver (PADI) |
| HP | High Pressure |
| PADI | Professional Association Of Diving Instructors |
| DIN | Deutsches Insitut Fuer Normung |
| HID | High Intensity Discharge |
| OD | Ocean Diver (BSAC) |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| ADT | Actual Dive Time |
| DO | Dive Officer (BSAC) |
| IOC | Instructor Orientation Course (PADI) |
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