GHZ

The noun has one meaning:

Meaning #1: 1,000,000,000 periods per second
  Synonyms: gigahertz, gigacycle per second, gigacycle, Gc

GHZ or GHz may refer to:

1. Gigahertz (units of frequency).
2. Greenberger-Horne-Zeilinger state (GHZ state) — a quantum entanglement of three particles.
3. Galactic Habitable Zone — the region of a galaxy that is favorable to the formation of life.
4. Green Hill Zone — the first level in the Sega Mega Drive game, Sonic the Hedgehog (16-bit).

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