| Acronym | Meaning |
| CNS | Central Nervous System |
| CESA | Controlled Emergency Swimming Ascent |
| BCD | Buoyancy Control Device |
| END | Equivalent Narcotic Depth |
| OW | Open Water Certification; First Certification Level. |
| C-CARD | Scuba Diving Certification Card. |
| MOD | Maximum Operating Depth |
| HID | High Intensity Discharge |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |
| EAR | Expired Air Resuscitation |