| Acronym | Meaning |
| PP | Partial Pressure |
| LAT | Lowest Astonomical Tide |
| EAN(X) | Enriched Air Nitrox |
| EO | Equipment Officer (BSAC) |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| AIC | Advanced Instructor Course (BSAC) |
| OD | Ocean Diver (BSAC) |
| SPG | Submerssible Pressure Guage |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| DEMA | Diving Equipment Manufacturers Association |