| Acronym | Definition |
|---|
| NIRS➣Near Infrared Spectroscopy |
| NIRS➣Near-Infrared Reflectance Spectroscopy |
| NIRS➣Nuclear Information and Resource Service |
| NIRS➣National Institute on Retirement Security (Washington, DC) |
| NIRS➣National Institute of Radiological Science |
| NIRS➣Noise Integrated Routing System (aviation) |
| NIRS➣National Information and Reporting System |
| NIRS➣National Informatics Recognition System |
| NIRS➣National Irrigation Research Station (Zambia) |
| NIRS➣Navy Implementation for Raster Scanning |