stool.

About stool

A stool is a raised seat commonly supported by three or four legs, but with neither armrests nor a backrest. Stools are usually wooden, and typically built to accommodate one occupant. As some of the earliest forms of seat, stools are sometimes called backless chairs despite how some modern stools have backrests. Folding stools can be collapsed into a flat, compact form typically by rotating the seat in parallel with fold-up legs.