USD is the currency code for the U.S. dollar set by the International Organization for Standardization (ISO). The ISO is an international standard-setting body composed of representatives from various national standards organizations. The ISO 4217 standard specifies the structure for a three-letter alphabetic code for the representation of currencies.

The designations for the major currencies are: U.S. dollar (USD), euro (EUR), Japanese yen (JPY), British pound (GBP), Australian dollar (AUD), Canadian dollar (CAD), Swiss franc (CHF), and Hong Kong dollar (HKD).

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