| Acronym | Meaning |
 | LP | Low Pressure |
| ITC | Instructor Training Course (BSAC) |
| TDT | Total Dive Time |
| TNT | Total Nitrogen Time |
| SWP | Safe Working Pressure |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| CESA | Controlled Emergency Swimming Ascent |
| PG | Pressure Group |
| SPG | Submerssible Pressure Guage |
| MCS | Marine Conservation Society |
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