Transom (architecture)
Horizontal structural piece separating a door from a window above it / From Wikipedia, the free encyclopedia
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For other uses, see Transom (disambiguation).
In architecture, a transom is a transverse horizontal structural beam or bar, or a crosspiece separating a door from a window above it. This contrasts with a mullion, a vertical structural member.[1] Transom or transom window is also the customary U.S. word used for a transom light, the window over this crosspiece.[1][2] In Britain, the transom light is usually referred to as a fanlight, often with a semi-circular shape, especially when the window is segmented like the slats of a folding hand fan. A prominent example of this is at the main entrance of 10 Downing Street, the official residence of the British prime minister.