In foreign exchange transactions, "JN" and "JW" are specific marks used to identify domestic transactions. When the domestic reporting unit makes external payment, if the payee is overseas, the paying bank will mark "(JW)" before the name of the other payee; otherwise, if the payee is a domestic non-resident, it will mark "(JN)". Similarly, when domestic residents receive and pay overseas, the words "(JW)" will appear in front of the name of the other payer, and the words "(JN)" will appear in the payment of domestic non-residents. These are the basic information regulations for banks to handle foreign-related payment business.

There are three main types of foreign exchange: freely convertible foreign exchange, limited freely convertible foreign exchange and bookkeeping foreign exchange. Convertible foreign exchange is the most common, such as US dollars and Hong Kong dollars. They can buy and sell freely in the international financial market to repay their debts and can be converted into the currencies of other countries. Limited freely convertible foreign exchange, such as RMB, although restricted in international transactions, may not be freely convertible or used for international payment without the approval of the currency issuing country. Bookkeeping foreign exchange, that is, it can only be deposited in the bank account designated by both parties, and cannot be converted into other currencies or paid externally. Usually used for specific bilateral transactions.

Generally speaking, the use of "JN" and "JW" is a necessary symbol to identify the nature and management of foreign exchange transactions. Knowing these signs is helpful to accurately understand and deal with related businesses in foreign exchange transactions.