| Acronym | Meaning |
 | TO | Training Officer (BSAC) |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| MDT | Maximum Dive Time |
| SPG | Submerssible Pressure Guage |
| BCD | Buoyancy Control Device |
| SI | Surface Interval |
| RYA | Royal Yachting Association |
| MSD | Master SCUBA Diver (PADI) |
| PP | Partial Pressure |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
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