bi (ancient Chinese jade disc)
Refers specifically to a flat, circular jade or glass artifact with a central hole, used in ancient China for ceremonial purposes. A specialized historical/archaeological term.
This museum has an ancient Chinese bi on display.
ritual jades worn by feudal lords in ancient China
perfect; flawless
From Chinese 璧 (bì). The exact historical derivation is uncertain; the spelling is conventionally associated with the jade disc artifact.