And what about the idea to use BITS ?

A metric prefix or SI prefix is a unit prefix that precedes a basic unit of measure to indicate a decadic multiple or fraction of the unit.
Each prefix has a unique symbol that is prepended to the unit symbol.

Decimal multiplicative prefixes have been a feature of all forms of the metric system with many dating back to the system's introduction in the 1790s. Metric prefixes have even been pre-pended to non-metric units. Today the prefixes are standardized for use in the International System of Units (SI) by the International Bureau of Weights and Measures (BIPM) in resolutions dating from 1960 to 1991.

The mill or mille (₥) (sometimes mil in the UK, when discussing property taxes in the United States, or previously in Cyprus and Malta) is a now-abstract unit of currency used sometimes in accounting. In the United States, it is a notional unit equivalent to 1⁄1000 of a United States dollar (a tenth of a cent). In the United Kingdom it was proposed during the decades of discussion on the decimalization 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".

The term mill is often used in finance, particularly in conjunction with equity market microstructure, as one-hundredth of a cent. For example, a broker that charges 5 mils per share is taking in $5 every 10,000 shares traded. Additionally, in finance the term is spelled "mil".