| Acronym | Meaning |
 | ATA | Atmospheres Absolute |
| BT | Bottom Time |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| CCR | Closed Circuit Rebreather |
| SPG | Submerssible Pressure Guage |
| EAR | Expired Air Resuscitation |
| MSD | Master SCUBA Diver (PADI) |
| EAN(X) | Enriched Air Nitrox |
| AIC | Advanced Instructor Course (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
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