Internationalization, Localization, and Unicode : Internationalization and Localization : Country

Country
The locale's country identifier is also specified by an ISO standard, ISO 3166, which describes valid two-letter codes for all countries. ISO 3166 defines these codes in uppercase letters. The following table lists some commonly used country codes.
The country code provides more contextual information for a locale and affects a language's usage, word spelling, and collation rules.

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