T-square
US /ˈtiː.skwer/
UK /ˈtiː.skwer/
1.
a T-shaped ruler used in technical drawing, consisting of a short crosspiece that slides along the edge of the drawing board and a longer arm at right angles to it, used for drawing parallel lines and for supporting set squares.
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The architect used a T-square to draw precise horizontal lines on the blueprint.
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Students learning drafting often start with basic tools like a T-square and triangles.