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  1. Oxford American Dictionary

    set square

    • IPA[ˈset ˌskwer]

    美式

    • n.
      a right-angled triangular plate for drawing lines, especially at 90°, 45°, 60°, or 30°.；a form of T-square with an additional arm turning on a pivot for drawing lines at fixed angles to the head.

    • noun: set square, plural noun: set squares