Stool, a stepping stone to mount a horse in ancient times, is called "stool" or "Mazar -e". Most ancient people sat on mats, so-called "sitting on the ground" (taking the ground as a mat). Seats, chairs, guest seats and banquets are all extensions of seats. Later generations added a backrest to Mazar, which was named "chair" because it could "rely on". Therefore, whether it is a mat, a stool, a chair or even a sofa, all the "sitting" positions are called "seats", no matter what you are sitting on. Sitting on a stool also means "sit" and "sit" If you have to show what you are sitting on, you can say "sit on a square stool"