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set square

noun
  1. a thin flat piece of plastic, metal, etc, in the shape of a right-angled triangle, used in technical drawing
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for set square

Historical Examples

  • Then the margins at the top and the two sides must be marked out, and the upright lines drawn in by means of the set-square.

    Illumination and its Development in the Present Day

    Sidney Farnsworth

  • For this purpose a tee-square and set-square are required, together with a pair of spring dividers and a sharply-pointed HB.

  • And it is important that you should get these straight-edges at a true right angle, testing them carefully with the set-square.