| Acronym | Meaning |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| MDL | No Decompression Limit |
| NAUI | National Association Of Underwater Instructors |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| OWI | Open Water Instructor (BSAC) |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| PSI | Pounds Per Square Inch |
| AIE | Advanced Instructor Exam (BSAC) |
| CNS | Central Nervous System |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |