Carpenter's square redirects here. For the plant, see Scrophularia marilandica.

In carpentry, a square or set square is a guide for establishing right angles (ninety-degree angles), usually made of metal and in the shape of a right triangle.

This Old House describes several types and uses of squares : ^*

See also:

• Try square
• Combination square
• Speed Square
• Steel square

Woodworking hand tools