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.) Transom or transom window is also the customary U.S. word used for a transom light, the window over such a crosspiece.
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.) Transom or transom window is also the customary U.S. word used for a transom light, the window over such a crosspiece.
Source: Wikipedia "Transom (architecture)" · CC BY-SA 4.0
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