A heavy horizontal member in suspended ceiling construction.

A drain pipe having a half or threequarter circular cross section; open along the top.

A rolled iron or steel bar whose U-shaped cross section is formed by a broad central section, called a web,

A method of window glazing which uses removable, surface-mounted, U-shaped metal stops or beads to fix the glass in place.

A structural member having a U-shaped cross section.

The temperature at which the thermal transmission loss to the outside of a building equals the heat gain in the