| Acronym | Meaning |
 | ITW | Instructor Training Workshop (BSAC) |
| DO | Dive Officer (BSAC) |
| MDL | No Decompression Limit |
| EAR | Expired Air Resuscitation |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| BC | Bouyancy Compensator |
| PSI | Pounds Per Square Inch |
| BWRAF | Buoyancy |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
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