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GRB or Grb may refer to

  • Austin Straubel International Airport (IATA airport code), an airport southwest of Green Bay, Wisconsin, U.S.
  • Gamma-ray burst, a type of very violent cosmic event, detectable on Earth as a short, intense burst of gamma rays.
  • Game Rating Board, a South Korean game rating organization.
  • A word in the Croatian for the Coat of arms of Croatia, Hrvatski Grb.
  • Grebo language (ISO 639-2 language code), spoken by the Grebo people of Liberia and the Krumen of Ivory Coast.