An underground drain which is rectangular in cross section; usually constructed of concrete or brick.

A culvert, usually of reinforced concrete, which is rectangular in cross section.

A chisel, one end of which is notched; used to pry open boxes that are nailed.

A sliding bolt which is rectangular in cross section; attached to a door at the edge, it slides into a

A hollow beam, usually rectangular in section; if fabricated of steel, the sides are steel plates welded together, or they