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.
Over the door window.
Historically operable transom windows above doors played a role in the heating and cooling in a home.
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Operable transoms have sashes that can be opened or closed to help regulate the temperature in a room when the door is closed.
Word used for a transom light the window over this crosspiece.
An open transom window in the winter helped heat from the central fireplace reach bedrooms at night.
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.