Opera window

An opera window is a small fixed window usually behind the rear side window of an automobile. They are typically mounted in the C-pillar of some cars. The design feature was popular during the 1970s and early 1980s and adopted by domestic U.S. manufacturers, most often with a vinyl roof.

The origin was from "opera" vehicles of around 1915 with occasional collapsible seating for extra passengers. The opera window was also a feature on "formal roof" and limousine models with higher than a normal roof to accommodate passengers with top hats.