| Acronym | Meaning |
 | IDEA | International Diving Educators Association; Diving Instruction Organization. |
| IDC | Instructor Development Course (PADI) |
| IOC | Instructor Orientation Course (PADI) |
| DEMA | Diving Equipment Manufacturers Association |
| TNT | Total Nitrogen Time |
| BCD | Buoyancy Control Device |
| ITC | Instructor Training Course (BSAC) |
| NAUI | National Association Of Underwater Instructors |
| SPG | Submerssible Pressure Guage |
| SI | Surface Interval |
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