This should be the suffix of international domain. After the disintegration of the former Yugoslavia, Serbia and Montenegro and the Republic of Serbia (Serbia and Montenegro) obtained the domain name ". Cs ",used in Montenegro". I "used it with Serbia after independence". rs”。 Other domain names that have disappeared are East Germany (. Dd) and Zaire (. Zr), and the former Soviet Union (. Sue).

Country code (or country code) is a set of geographical codes used to represent countries and overseas territories. The country code is a series of short letters or numbers, which is convenient for data processing and communication. There are many different national code standards in the world, the most widely known of which is ISO 3 166- 1. The country code can also refer to the country code of international long-distance calls, that is, the international telephone area code of the International Telecommunication Union (E. 164).