	Seal knob (紐刻) is an art that originated in ancient China and is mainly popular in East Asian countries. It focuses or decorates on the head-part or the top-side of a seal. It is a kind of sculpture or mini-sculpture. In China, the utmost important seal of all is the imperial seal carved from the Heshibi, a sacred ceremonial jade. It was said that the green jade took the form of a round shape with inscriptions that read "Having received the Mandate from Heaven, may (the emperor) lead a long and prosperous life." (受命於天,既壽永昌) This was said to be written by the Primer Li Si for Qin Shi Huang Zhao Zheng, the Augustus Emperor of The Chinese Empire.