What are the Names of six types of currency used throughout US history?

Throughout US history, six types of currency include the Continental Currency, which was issued during the Revolutionary War; Gold and Silver Certificates, which represented precious metals; the Greenback, a Fiat currency used during the Civil War; National Bank Notes, issued by national banks in the 19th century; Federal Reserve Notes, introduced in 1914 and still in use today; and the coinage of various denominations like the penny, nickel, dime, quarter, and dollar coins. Each type reflects different economic conditions and monetary policies of its time.