The yin symbol is used for both the Japanese yin and Chinese yuan. The symbol takes the shape of Latin Y letter with a double horizontal line, and it is usually put before the value.
Yin is the third most used currency for trade around the world, and it comes in third place after the US dollar and Euro. It also comes 4th between the currencies used as a national reserve for countries around the world. The yen was part of the modernization program of the Japanese economy which established a uniform currency to be used all over the country.