| Acronym | Meaning |
 | SSI | Scuba Schools International; Diving Instruction Organization. |
| PSI | Pounds Per Square Inch |
| OWIC | Open Water Instructor Course (BSAC) |
| BT | Bottom Time |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| EAR | Expired Air Resuscitation |
| DV | Demand Valve |
| OW | Open Water Certification; First Certification Level. |
| DL | Dive Leader (BSAC) |
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