Jiaobei

Jiaobei blocks or moon blocks (筊杯, jiǎo bēi, lit. `bamboo cups`) are wooden divination tools originating from China, which are used in pairs and thrown to answer a yes or no question. They are made out of wood or bamboo and carved into a crescent shape. Each block is round on one side (known as the yin side) and flat on the other (known as.....
Found on http://en.wikipedia.org/wiki/Jiaobei
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