ISO 3166-1 alpha-2 is a widely used country code system, along with what three-letter system?
ISO 3166-1 alpha-3 ISO 3166-1 alpha-3 codes are three-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They allow a better visual association between the codes and the country names than the two-letter alpha-2 codes (the third set of codes is numeric and hence offers no visual association). They were first included as part of the ISO 3166 standard in its first edition in 1974.
International Networks (country code) International Networks is the name given by the International Telecommunications Union (ITU) to country calling codes 882 and 883, and serves as a catch-all for telephone services not dedicated to a single country. Satellite telephone carriers, especially those with worldwide service, are allocated within the Global Mobile Satellite System (GMSS), country code 881, with the exception of non-terrestrial Inmarsat, country code 870.