| Abbreviation | Definition |
|---|---|
| NR | Not Required |
| NR/T | Near Real-Time |
| NRC | National Research Council |
| NRC | Non-Recurring Cost |
| NRCA | Nonconformance Report and Corrective Action |
| NRCC | National Research Council of Canada |
| NREN | NASA Research and Education Network |
| NRI | Nonrecurring Investment |
| NRI | Non-Recurring Investment |
| NRM | Nonrecurring Maintenance |
| NRM | Non-Recurring Maintenance |
| NRP | NASA Resource Protection |
| NRP | Normal Rated Power |
| NRS | Nonconformance Reporting System |
| NRT | Norm-Referenced Test |
| NRTS | Not Repairable at This Station |
| NRZ | Non-Return-to-Zero |
| NRZ-L | Non Return to Zero Level |
| NRZ-L | Non-Return-to-Zero Level |
| NS | Nickel Steel |