| LPFN | low-pass filtered noise |
|---|---|
| LPFS | low-pass filtered signal |
| NF | nafcillin; National Formulary; nephritic factor; neurofibromatosis; neurofilament; neutral fraction;... |
| TQFCOSY | triple-quantum filtered correlated spectroscopy |
| SET | Singlephoton Emission Tomography = SPECT |