ISO 3166-1 Alpha-2

ISO 3166-1 alpha-2 codes are two-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 are the most widely used of the country codes published by ISO (the others being alpha-3 and numeric), and are used most prominently for the Internet's country code top-level domains (with a few exceptions). They were first included as part of the ISO 3166 standard in its first edition in 1974.

Read more about ISO 3166-1 Alpha-2:  Uses and Applications

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ISO 3166-1 Alpha-2 - Current Codes - Reserved Code Elements - Indeterminate Reservations
... Nations Conventions on Road Traffic but differing from those contained in ISO 3166-1 ... eventually to be either eliminated or replaced by code elements within ISO 3166-1 ... In the meantime, the ISO 3166/MA has reserved such code elements for an indeterminate period ...