| Acronym | Meaning |
 | MOD | Maximum Operating Depth |
| PADI | Professional Association Of Diving Instructors |
| HID | High Intensity Discharge |
| BCD | Buoyancy Control Device |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| END | Equivalent Narcotic Depth |
| MDL | No Decompression Limit |
| NI | National Instructor (BSAC) |
| CAGE | Cerebral Arterial Gas Embolism |
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