SMS Chat and Text
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. | - | SMS Chat and Text |
| NAUI | National Association Of Underwater Instructors | - | SMS Chat and Text |
| NI | National Instructor (BSAC) | - | SMS Chat and Text |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. | - | SMS Chat and Text |