| Abbreviation | Definition |
|---|---|
| NR | Not Recorded |
| NRD | Negative Resist Developer |
| NRS | Nuclear Retention Signal |
| NRTL | Non-Random-Two-Liquid |
| NS | Non-Symmetric |
| NS | Normal Saline |
| NS | Not Significant |
| NSE | No Stereoidal Esterase |
| NSEC | National Standard Examination in Chemistry |
| NSLAB | Non-Starter Lactic Acid Bacteria |
| NSP | Non-Starch Polysaccharide |
| NSR | Nitride Semiconductor Research |
| NSSC | Neutral Sulfite Semi-Chemical |
| NSSC | Neutral Sulphite Semi Chemical |
| NT | Nuclear Transfer |
| NTA | NitriloTriacetic Acid |
| NTA | Nitro Triacetic Acid |
| NTC | Negative Temperature Coefficient |
| NTP | Normal Temperature and Pressure |
| NU | Natural Uranium |