| LEPN | effective perceived noise level |
|---|---|
| LPFN | low-pass filtered noise |
| MNA | maximum noise area |
| NAC | N-acetylcysteine; National Asthma Center; National Audiovisual Center; Noise Advisory Council |
| NC | nasal cannula; nasal clearance; neck complaint; neonatal cholestasis; neural crest; neurologic check... |