Abbreviation for US Dollar. The dollar is the most common currency in the United States. Worth 100 cents, the USD is a green bill with George Washington's face on one side. Demonations of USD bills are 1, 2 (no longer made but still circulating), 5, 10, 20, 50, 100, 1000, 10,000, and 100,000 dollar increments. All USD bills are colored green, but some new bills are entering circulation that have other colors as well. The symbol of the USD is '$', i.e. 10 dollars is notated as '$10'. There is also a one dollar coin called the Susan B. Anthony Dollar from the face of the woman etched on one side.