| Acronym | Meaning |
 | RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| TNT | Total Nitrogen Time |
| PADI | Professional Association Of Diving Instructors |
| SI | Surface Interval |
| DL | Dive Leader (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| PPB | Peak Performance Bouyancy |
| ITW | Instructor Training Workshop (BSAC) |
| END | Equivalent Narcotic Depth |
| DPV | Diver Propulsion Vehicle |
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