| Acronym | Meaning |
 | HID | High Intensity Discharge |
| DAN | Divers Alert Network |
| TP | Test Pressure |
| AGE | Aterial Gas Embolism |
| IAND | International Association Of Nitrox Divers |
| SAR | Search And Rescue/Recovery |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| SPG | Submerssible Pressure Guage |
| NI | National Instructor (BSAC) |
| TNT | Total Nitrogen Time |
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