| Acronym | Meaning |
 | IDC | Instructor Development Course (PADI) |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| IOC | Instructor Orientation Course (PADI) |
| ITC | Instructor Training Course (BSAC) |
| ITS | Instructor Training Scheme (BSAC) |
| ITW | Instructor Training Workshop (BSAC) |
| LAT | Lowest Astonomical Tide |
| LP | Low Pressure |
| MCA | Maritime And Coastguard Agency |
| MCS | Marine Conservation Society |
| MDL | No Decompression Limit |
| MDT | Maximum Dive Time |
| MOD | Maximum Operating Depth |
| MSD | Master SCUBA Diver (PADI) |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| NAUI | National Association Of Underwater Instructors |
| NI | National Instructor (BSAC) |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| OD | Ocean Diver (BSAC) |
| OW | Open Water Certification; First Certification Level. |
| OW(D) | Open Water (Diver) (PADI) |
| OWI | Open Water Instructor (BSAC) |
| OWIC | Open Water Instructor Course (BSAC) |
| OWSI | Open Water SCUBA Instructor (PADI) |
| PADI | Professional Association Of Diving Instructors |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| PG | Pressure Group |
| PP | Partial Pressure |
| PPB | Peak Performance Bouyancy |
| PSI | Pounds Per Square Inch |
| RD | Rescue Diver (PADI) |
| RDP | Recreational Dive Planner |
| RIB | Rigid-Hulled Inflatable Boat |
| RNT | Residual Nitrogen Time |
| ROV | Remotly Operated Vehicle |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| RYA | Royal Yachting Association |
| SAA | Sub-Aqua Association |
| SAR | Search And Rescue/Recovery |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| SI | Surface Interval |
| SPG | Submerssible Pressure Guage |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| SWP | Safe Working Pressure |
| TDT | Total Dive Time |
| TNT | Total Nitrogen Time |
| TO | Training Officer (BSAC) |
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