United Nations Document Codes

The United Nations issues most of its official documents in its six working languages: Arabic, Chinese, English, French, Russian and Spanish. Many are also issued in German, which in 1973 gained the status of "documentation language" and has its own translation unit at the UN. The official documents are published under the United Nations masthead and each is identified by a unique document code (symbol) for reference, indicating the organ to which it is linked and a sequential number.

Source: Wikipedia — United Nations Document Codes (CC BY-SA 4.0)