winkelhaak

Etymology
From, from.

Noun

 * 1) try square, carpenter's square
 * 2) a rectangular tear or cut in fabric

Etymology
From. Equivalent to.

Noun

 * 1) try square; or, generally, any kind of square used by masons and carpenters to measure right angles, such as a steel square or a carpenter's square
 * 2) a rectangular tear or cut in a piece of clothing or other fabric, in the form of a try square.