| Acronym | Meaning |
 | NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| DIR | Doing It Right |
| ITW | Instructor Training Workshop (BSAC) |
| DCS | Decompression Sickness |
| BT | Bottom Time |
| IOC | Instructor Orientation Course (PADI) |
| BC | Bouyancy Compensator |
| IAND | International Association Of Nitrox Divers |
| NI | National Instructor (BSAC) |
| CESA | Controlled Emergency Swimming Ascent |
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