| Acronym | Meaning |
 | SPG | Submerssible Pressure Guage |
| ABT | Actual Bottom Time |
| ATA | Atmospheres Absolute |
| GMDSS | Global Maritime Distress And Safety System |
| LP | Low Pressure |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| RNT | Residual Nitrogen Time |
| DIN | Deutsches Insitut Fuer Normung |
| AIC | Advanced Instructor Course (BSAC) |
| PSI | Pounds Per Square Inch |
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