Look up USD in Wiktionary, the free dictionary.

USD stands for:

• United States dollar, the official currency of the United States
• University of San Diego, San Diego, California, USA
• University of South Dakota, Vermillion, South Dakota, USA
• Under Secretary of Defense, the third-highest ranking position in the U.S. Department of Defense
• Unified school district, an Identification Number for most public schools in America
• the Upside Down, an escape routine by Harry Houdini

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