Qing dynasty
From the early Qing, the central government was characterized by a system of dual appointments by which each position in the central government had a Manchu and a Han Chinese assigned to it. The Han Chinese appointee was required to do the substantive work and the Manchu to ensure Han loyalty to Qing rule. The distinction between Han Chinese and Manchus extended to their court costumes. During the Qianlong Emperor's reign, for example, members of his family were distinguished by garments with a small circular emblem on the back, whereas Han officials wore clothing with a square emblem.

Q: What shape of emblam signified members of the royal family?
circular