A sheet of metal refers to a flat, thin piece of metal that is cut or rolled into shape. It can be made from various types of metals such as steel, aluminum, copper, and brass among others. The thickness, width, and length of the sheet depend on its intended use. Sheet metal is used in a wide range of applications including construction, automotive, aerospace, electronics, and machinery manufacturing. It can be bent or formed into different shapes to create various components such as ducts, vents, enclosures, and panels among others.