A stool is one of the earliest forms of seat furniture. It bears many similarities to a chair. It consists of a single seat, for one person, without back or armrests (in early stools), on a base of a stool there are either one , two, three or four legs.
Wikimedia Foundation. (2021, March 3). Stool (seat). Wikipedia. https://en.wikipedia.org/wiki/Stool_(seat)#:~:text=A%20stool%20is%20one%20of,two%2C%20three%20or%20four%20legs.