Supporting Piece is a term used to describe a structural component that provides support and stability to a structure. The three crossword solutions for this term are STRUT (5 letters), LEG (3 letters), and STAY (4 letters). A STRUT is a structural member that is used to brace or support a structure, while a LEG is a structural member that supports the weight of a structure. A STAY is a structural member that helps to keep a structure in place and provide additional support. All three of these components work together to provide support and stability to a structure.