Money Basics History of United States Currency Understanding the Security Features of Money (opens new window) (You will be leaving NCUA.gov and accessing a non-NCUA website. We encourage you to read the NCUA's exit link policies. (opens new page).) What to Do if You Receive Counterfeit Money Money Notes - Facts about U.S. Coins and Currency Test Your Money Memory How well do you know the faces on dollars and coins?