| Acronym | Meaning |
 | BHA | British Hyperbaric Association |
| PSI | Pounds Per Square Inch |
| MCA | Maritime And Coastguard Agency |
| NI | National Instructor (BSAC) |
| CESA | Controlled Emergency Swimming Ascent |
| DIR | Doing It Right |
| DL | Dive Leader (BSAC) |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |
| HP | High Pressure |
| OD | Ocean Diver (BSAC) |
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