The basic unit of the won is the won. The monetary unit in Korea is "_", and Chinese characters are written as "circle" or "yuan". Pinyin is represented by "win" (_). Sometimes I still use the old name "_" (_, Won). ISO42 17 defines its standard code as KRW. There are two kinds of Korean currency: paper money and coins. There are four kinds of paper money: 1000 won, 5000 won, 10000 won and 50000 won, which can be easily distinguished according to the historical figures and colors printed on the paper money.