| No, no | number [Lat. numero] |
|---|---|
| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |
| NR | Reynold's number |
| NSA | Neurological Society of America; normal serum albumin; no salt added; no significant abnormality; no... |
| NUI | number user identification |