The United States dollar (sign: $; code: USD; also abbreviated US$ and referred to as the dollar, U.S. dollar, or American dollar) is the official currency of the United States and its territories per the United States Constitution since 1792. For most practical purposes, it is divided into 100 smaller cent (¢) units, but is occasionally divided into 1000 mills (₥) for accounting purposes. The circulating paper money consists of Federal Reserve Notes that are denominated in United States dollars (12 U.S.C. § 418).