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GHZ or GHz may refer to:
- Gigahertz (GHz), a unit of frequency
- Greenberger–Horne–Zeilinger state, a quantum entanglement of three particles.
- Galactic Habitable Zone, the region of a galaxy that is favorable to the formation of life
- Green Hill Zone, the first level in Sonic the Hedgehog (1991 video game)
|This disambiguation page lists articles associated with the title GHZ.
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