GB/T 12406-1996 Codes representing currencies and funds (idt ISO 4217:1990)
GB/T2659-1994 Codes for names of countries and regions in the world (eqv ISO 3166-1:1997)
In the ISO4217:2008 standard, it is used to represent currency and funds. This standard specifies a three-letter letter code and equivalent three-digit code to represent currency and funds. For those small unit currencies it also shows the decimal for those units and the currency itself