Before revision: Diagram of two T-beams|alt=|458x458px A -beam (or tee beam), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a -shaped cross section.
After revision: Diagram of two TT-beams|alt=|458x458px A -beam (or tee beam), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a -shaped cross section.