Nj

Nj or NJ may stand for:

• New Jersey
• Nanojoule (nJ), an International System of Units (SI) unit of energy equal to 10⁻⁹ joules
• Nj (digraph)
• Narva-Jõesuu, Estonia
• Nordjyske Jernbaner, a Danish railway
• Neighbor-joining, a bioinformatic method for the construction of phylogenetic trees
• Napierville Junction Railway

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