A transom is a window above a window or door, used in various architectural styles to allow light into a building.
Transom is the correct term for a window above a window or door, allowing light into a tall building. An example of this architectural feature is the clerestory windows rising above a lower roof in Gothic architecture. In the 'Chicago window,' a large fixed center panel with two flanking double-hung sash windows exemplifies another type of window arrangement.
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