NH4
NH4 or NH 4 or NH-4 may refer to:
- Ammonium, the cation NH+
4 in chemistry - National Highway 4 (India), new numbering for a National Highway in India
- National Highway 4 (India, old numbering), a major National Highway in western and southern India
- New Hampshire Route 4, a short state highway located in eastern Strafford County, New Hampshire, United States
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