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There are many uses for ISO 3166. Many organizations use the codes to identify countries unambiguously across languages (e.g. to distinguish between Austria/Australia and Sweden/Switzerland); international organizations often use the codes in logistics, medical information, financial transaction/currency codes, telecommunications, travel, and postal services. By using ISO 3166 codes, clarity is provided in communicating information to people and organizations around the globe, without having to know local languages and dialects.
See also How ISO codes connect the world.