KevWind.
Those look nice! I bet even I can make those..
Ya.. I heard of them being called "Gobos"..
From Google " Gobo is a sound recording term for a movable acoustic isolation panel.
In typical use, a recording engineer might put a gobo between two musicians to increase the isolation of their microphones from each other.
The origin of the term "gobo" is obscure, but is most likely short for "go-between."