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The International Organization for Standardization (ISO) under its standard ISO 3166 has established two-letter ( 2-alpha ) and three-letter ( 3-alpha ) codes for the various countries of the world, including independent states, dependent areas, and certain areas of contested jurisdiction or special status. These codes are published and revised when needed by the ISO 3166 Maintenance Agency . The Internet Assigned Numbers Authority (IANA) assigns two-letter codes for country-coded top-level domains in Internet addresses. These codes are the same as the ISO 2-alpha codes in nearly all cases. The International Olympic Committee also assigns three-letter codes to its national organizing committees and the teams they send to the Olympic Games.