chîⁿ-îⁿ錢圓

an ancient coin with a square hole in the centre

an ancient coin with a square hole in the centre; copper cash; coin

English Wiktionary, “錢圓” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%8C%A2%E5%9C%93 · confidence: Medium (Wiktionary)