The mill is a unit of currency, used in several countries as one-thousandth of the main unit. In the United States, it is a notional unit equivalent to a thousandth of a United States dollar (a hundredth of a dime or a tenth of a cent). In the United Kingdom, it was proposed during the decades of discussion on the decimalisation of the pound as a 1⁄1000 division of the pound sterling. Several other currencies used the mill, such as the Maltese lira.
The term comes from the Latin "millesimum", meaning "thousandth part".