| Acronym | Meaning |
 | AIC | Advanced Instructor Course (BSAC) |
| HPNS | High Pressure Nervous Syndrome |
| SPG | Submerssible Pressure Guage |
| PP | Partial Pressure |
| EAN(X) | Enriched Air Nitrox |
| PADI | Professional Association Of Diving Instructors |
| AAS | Alternate Air Source |
| LP | Low Pressure |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| OD | Ocean Diver (BSAC) |
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