ZJ or zJ may refer to:
Places
- Zhejiang, a province of China
Science and mathematics
- Zeptojoule (zJ), a small SI unit of energy
- Zettajoule (ZJ), a large SI unit of energy
- ZJ theorem, 1968, in group theory
Transport
- Jeep Grand Cherokee (ZJ), 1993 models of the sports utility vehicle
- Zambezi Airlines (2008–2012; IATA:
ZJ
)
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