| Abbreviation | Definition |
|---|---|
| NRC | Nicole Rospigliosi Costa |
| NRF | Non-Run-Flat Tire |
| NRFB | Never Removed From Box |
| NRP | Non-Removable Pin |
| NRR | Noise Reduction Rating |
| NRR | Non-Return Rate |
| NRRh | Noise Reduction Rating for the Higher-rated protector |
| NRRl | Noise Reduction Rating for the Lower-rated protector |
| NRRO | Non-Repeatable Run-Out |
| NRRQ | Natural Rose Quartz |
| NRRV | Non-Road Recreational Vehicle |
| NRRW | Narrow |
| NRTL | Nationally Recognized Testing Labratory |
| NRZ | Non Return to Zero |
| NS | No Slip |
| NS | non-standard |
| NSFW | Not Suitable For Women |
| NSK | No Specific Kind |
| NSOP | National Standards for Organic Products |
| NSP | Specialty Products |