| Acronym | Meaning |
 | AAS | Alternate Air Source |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| MOD | Maximum Operating Depth |
| LP | Low Pressure |
| IAND | International Association Of Nitrox Divers |
| HP | High Pressure |
| DIN | Deutsches Insitut Fuer Normung |
| END | Equivalent Narcotic Depth |
| AIE | Advanced Instructor Exam (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
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