| Abbreviation | Definition |
|---|---|
| NI | No Interleaving |
| NI | Node Identification |
| NI | Node Identifier |
| NI | Node Initialization |
| NI | Non-Inductive |
| NIC | Network Interface Card |
| NIC | Noise Isolation Class |
| NICAM | Near Instantaneous Companded Audio Multiplex |
| NIEITS | National Institute of Electronics and Information Technology Srinagar |
| NIELIT | National Institute of Electronics & Information Technology |
| NIER | Non-Ionizing. Electromagnetic Radiation |
| NIH | National Institutes of Health |
| NIM | Network Interface Module |
| NINP | No Interference No Protection |
| NIR | Near Infrared Reflectance |
| NIS | Normal Insulating and Superconducting |
| NKCE | Non Kinetic Counter Electronics |
| NKE | New Korea Electric |
| NKE | Nippon Kouatsu Electric |
| NL | Neutral Line |