筶

* 古代占卜用具，用类似于蚌壳的两半器物制成，合拢拿在手里，掷于地，观其俯仰，以占吉凶

(translated) An ancient divination tool made of two halves of clam shell-like objects, held together in the hand and tossed to the ground to observe if they land face-up or face-down, and thus divine good or ill fortune