Transom Window

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A transom window (or transom light) got its name from where it's usually installed—over the transom, the area over a door or a big window.

Transom windows originated in the 14th century, where they could bring daylight into a room while their height could provide some semblance of privacy. Traditionally, transom windows come in a standard rectangular shape, but most modern transom windows today are available in a wide range of shapes and sizes. They usually don’t open, but some manufacturers can make transom windows that can be operated for additional ventilation.

Fanlights or lunette/half-moon windows are a subdivision of transom windows, which are arched and decorative.