| Acronym | Meaning |
 | NI | National Instructor (BSAC) |
| MSD | Master SCUBA Diver (PADI) |
| CAGE | Cerebral Arterial Gas Embolism |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| MDT | Maximum Dive Time |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| BSAC | British Sub-Aqua Club |
| IOC | Instructor Orientation Course (PADI) |
| SPG | Submerssible Pressure Guage |
| ITW | Instructor Training Workshop (BSAC) |
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