Youtai
The classes of ancient people were divided into ten classes, six classes for fear and ten classes for Taiwan. So the platform refers to people with humble service and low status.
Selected works. Zhang Xie. Seven lives: "the woodcutter is ashamed of the dangerous crown, and the stage laughs short and then wears it." 」
Song Shu Volume 30. Five elements: "At the end of the Jin Dynasty, everyone was crowned with a small crown, but the clothes were rich and romantic, and the platform was popular." 」
Or "jade soap".