In architecture, a transom is a transverse horizontal structural beam or bar, or a crosspiece separating a door from a window above it. Transom or transom window is also the customary U.S. word used f
Door of 10 Downing Street, London, showing a transom separating the door from the fanlight window above
A ranma found in Kōchi Castle designed to look like a wave
A fanlight is a form of lunette window, often semicircular or semi-elliptical in shape, with glazing bars or tracery sets radiating like an open hand fan. It is placed over another window or a doorway
Transom (architecture)
…the customary U.S. word used for a transom light, the window over such a crosspiece. Speakers of British English usually call such a transom light a "fanlight". Fanlights often have a semi-circular shape, especially when the window is segmented like the slats of a folding hand-fan. A prominent example of this…
Fanlight at Montgomery's Inn in Toronto, Ontario
Hotel in Ariah Park, New South Wales, with its name in the fanlight