Wiktionary
ring binders
n. (ring binder English)
Usage examples of "ring binders".
Her father had kept field notes much like a daybook, jotting notes about the young officers he trained, the perps he busted, and the kids he was trying to help, all dated, and crammed into seven small three-ring binders thick with pages.
Two curtained windows, doors to a private bathroom and a closet, a chrome-and-glass storage unit stuffed with paperbacks, spiral notebooks, three-ring binders, loose paper, a cheap Tijuana plaster statue of a bull.
It was a franchise operation, except it had ziggurats instead of golden arches, and clay tablets instead of three-ring binders.