NH4

NH4 or NH-4 can mean:

• Ammonium, the NH+
  4 ion in chemistry
• National Highway 4 (India), a major National Highway in western and southern India
• New Hampshire Route 4, a 3.78-mile (6.08 km) long state highway located in eastern Strafford County, New Hampshire, USA
• New Hampshire's 4th congressional district, an obsolete electoral district in New Hampshire, USA

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