 They hold a place in various superstitions, as well as Traditional Chinese medicine, and Feng shui.Currencies based on the Chinese cash coins include the Japanese mon, Korean mun, Ryukyuan mon, and Vietnamese văn.The English term "cash", referring to the coin, comes from the Portuguese "caixa" which was derived from the Tamil "kāsu," a South Indian monetary unit derived from the Sanskrit silver and gold weight unit "karsa".