A flat piece of metal with a cut-out pattern or effect on stage is called, gobo.
A "Gobo" is a tiny, round disc that is used in lighting fixtures to project an image or pattern. It has a stencil on it. Gobo, which means "Go Between Optics," is a phrase used to describe where a lighting fixture must be located in order for it to be used in the light path.
The most popular type of ellipsoidal lighting instruments is one that lets you adjust the focus of the light and gobo by shifting the lens back and forth inside the lens tube. Gobos are versatile tools that may be used for a variety of tasks, such as projecting your brand logo or breakdown patterns to add texture to walls.
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