| Acronym | Meaning |
 | MDL | No Decompression Limit |
| AAS | Alternate Air Source |
| AOW | Advanced Open Water |
| PPB | Peak Performance Bouyancy |
| OD | Ocean Diver (BSAC) |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| AIC | Advanced Instructor Course (BSAC) |
| EO | Equipment Officer (BSAC) |
| AMDT | Adjusted Maximum Dive Time |
| OWSI | Open Water SCUBA Instructor (PADI) |
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