The circular Chinese jade disc with a central hole, traditionally associated with heaven, is called a bi.
Bi discs were made in China from the Neolithic period onward, especially by cultures such as Liangzhu. They usually have a round outer edge and a circular perforation, although their proportions and decoration vary widely. Some are plain, while others carry incised patterns or raised bosses.
In later Chinese ritual thought, the bi became associated with Heaven, while the square cong was linked with Earth. Jade bi were placed in tombs, used in ritual contexts, and sometimes displayed as symbols of rank. Their exact original function during the earliest periods remains debated by archaeologists.
A bi should not be confused with a cong, which has a square outer body, or with a huang, a curved jade pendant. The term describes a jade form, not one single dynasty or design.