The Coinage Act of 1792 introduced the U.S. dollar, American dollar, or colloquially buck) is the official currency of the United States and several other countries. The United States dollar ( symbol: $ currency code: USD also abbreviated US$ to distinguish it from other dollar-denominated currencies referred to as the dollar, U.S. Washingtons, Jeffersons, Lincolns, Hamiltons, Jacksons, Grants, Benjamins, C-note, grand, sawbuck, single, Bluefaces.Ace, bean, bill, bone, buck, deuce, dub, ducat, doubloon, fin, frog, greenback, large, simoleons, skins, smackeroo, smackers, spondulix, Tom, yard, and eagle.