| Acronym | Meaning |
 | IAND | International Association Of Nitrox Divers |
| NAUI | National Association Of Underwater Instructors |
| MDL | No Decompression Limit |
| END | Equivalent Narcotic Depth |
| BT | Bottom Time |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| DPV | Diver Propulsion Vehicle |
| OW | Open Water Certification; First Certification Level. |
| PSI | Pounds Per Square Inch |
| OW(D) | Open Water (Diver) (PADI) |
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