| Acronym | Meaning |
 | MSD | Master SCUBA Diver (PADI) |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| DIR | Doing It Right |
| EFR | Emergency First Response |
| SAR | Search And Rescue/Recovery |
| PSI | Pounds Per Square Inch |
| MOD | Maximum Operating Depth |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| HP | High Pressure |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
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