I’m referring to a wooden or plastic slab made to stand on-end for an actor to use to rest between takes. I saw one recently online in one of the pix posted by Peter Mayhew (Chewbacca) taken during filming of Star Wars. I saw one a long time ago in a Bette Davis movie in which she played an actress and wore a voluminous gown; she’d rest on one of these boards (wooden) between takes, and it had arm rests. I assume these boards were/are used so the actor won’t disturb his/her costume and makeup by sitting or lying down.
I had back surgery recently, and for now, standing is easier on me than sitting. (And sitting for a long time isn’t good regardless.) Anyway, when I saw the Mayhew photo I was reminded of the “resting board” and thought I could use one. I’ve searched to no avail. I don’t even know if I’d have room for something like it, but wanted to check it out.