| Acronym | Meaning |
 | CCR | Closed Circuit Rebreather |
| DCI | Decompression Illness |
| PG | Pressure Group |
| ABT | Actual Bottom Time |
| ITC | Instructor Training Course (BSAC) |
| AAS | Alternate Air Source |
| CESA | Controlled Emergency Swimming Ascent |
| EAN(X) | Enriched Air Nitrox |
| IDC | Instructor Development Course (PADI) |
| OW | Open Water Certification; First Certification Level. |
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