| Acronym | Meaning |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| DL | Dive Leader (BSAC) |
| IOC | Instructor Orientation Course (PADI) |
| DSMB | Delayed Surface Marker Buoy |
| DM | Dive Master (PADI) |
| DPV | Diver Propulsion Vehicle |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| SAR | Search And Rescue/Recovery |
| OD | Ocean Diver (BSAC) |