Disk (<em>bi</em> 璧)

Thick perforated disk of the type pi [bi] 璧; bored obliquely from both sides; mottled pale, bluish-green, olive green, and dull, dark brown, entire surface speckled and roughened with small dark particles that protrude even through the grayish areas of incipient disintegration. (Rim chipped and broken in several places.)