holed coin
方孔钱 铜钱 穴あき硬貨 穴あき古銭 五円玉 五円硬貨 五十円玉
A coin with a hole in the center. Commonly seen on the Chinese cash and Japanese yen coins, where the hole was meant to string them together into easily manageable bundles.
See also
This tag implicates coin (learn more).