brace; angle brace
A diagonal structural member used in timber framing or construction to reinforce a right-angle joint, preventing racking.
In this wooden building, angle braces are inserted between the posts and beams.
Compound of 方 (ほう, 'direction' or 'square') and 杖 (つえ, 'cane' or 'support'), referring to a supporting piece placed diagonally at a corner.