Historically operable transom windows above doors played a role in the heating and cooling in a home.
Over the door window.
This contrasts with a mullion a vertical structural member.
An open transom window in the winter helped heat from the central fireplace reach bedrooms at night.
Transom or transom window is also the customary u s.
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In architecture a transom is a transverse horizontal structural beam or bar or a crosspiece separating a door from a window above it.
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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.