A three-legged seat, also known as a STOOL or TRIPOD, is a type of furniture that has three legs for support. It is usually made of wood and is used as a chair or a table. The term 'three-legged seat' is often used to describe a STOOL, which is a short seat with no back or armrests. A TRIPOD is a similar type of furniture, but it has three legs that are connected at the top, creating a stable base. Both types of furniture are commonly used in homes and businesses.