| Acronym | Meaning |
 | IOC | Instructor Orientation Course (PADI) |
| IAND | International Association Of Nitrox Divers |
| DO | Dive Officer (BSAC) |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| PADI | Professional Association Of Diving Instructors |
| DCI | Decompression Illness |
| TO | Training Officer (BSAC) |
| DL | Dive Leader (BSAC) |
| HID | High Intensity Discharge |
| AIE | Advanced Instructor Exam (BSAC) |
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