Answer:
Butterfly shaped cleat inserted into adjoining boards, to hold them together. Butterfly Wedge in furniture refers to a type of joint or fastening mechanism used to stabilize or strengthen two pieces of wood that are meeting at a corner or joint. It consists of a piece of wood or metal shaped like a butterfly with two wings that fan out from a central body. The butterfly wedge is inserted into a slot or mortise cut into the two pieces of wood, and when it is tightened or hammered in, it expands and locks the joint, providing additional strength and stability. The name Butterfly Wedge is derived from the shape of the fastening mechanism, which resembles the wings of a butterfly when opened.