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Proper noun[edit]


  1. Initialism of Government Communications Headquarters.
    • 2013, Ravi Gupta, Hugh Brooks, Using Social Media for Global Security, page 190:
      For the challenge, GCHQ posted a code at www.canyoucrackit.co.uk and invited British citizens to solve it. The code consisted of 160 letters and numbers arranged in a rectangular display.

See also[edit]