A try square is a special-purpose square in wood- and metalworking used to mark or measure material

The name 'try square' comes from the concepts of 'trying a surface' (to check a surface's straightness or correspondence to an adjacent surface) and 'square' (45° and 90°, or right, angle).

The try square is used mostly for Laying out lines perpendicular to an edge or side of a board. Checking edges and ends of boards to see if they are square with adjoining surfaces.

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