| Acronym | Meaning |
 | SWP | Safe Working Pressure |
| SAA | Sub-Aqua Association |
| MCS | Marine Conservation Society |
| MCA | Maritime And Coastguard Agency |
| MDL | No Decompression Limit |
| DL | Dive Leader (BSAC) |
| OWI | Open Water Instructor (BSAC) |
| DEMA | Diving Equipment Manufacturers Association |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| ITW | Instructor Training Workshop (BSAC) |
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