四出文钱

sì chū wén qiánsichuwenqian

1. coin minted in the reign of Emperor Ling of Han 漢靈帝|汉灵帝[Han4 Ling2 Di4], with a square hole in the middle and four lines radiating out from each corner of the square (hence the name 四出文)

Study it in Yanamino