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Metric prefixes have even been prepended to non-metric units.
The SI 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.
For large scales, megametre, gigametre, and larger are rarely used.
Instead, non-metric units are used, such as astronomical units, light years, and parsecs; the astronomical unit is mentioned in the SI standards as an accepted non-SI unit.
Each prefix has a unique symbol that is prepended to the unit symbol.
The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams.
Metric prefixes may also be used with non-metric units.
In Europe, the centilitre is often used for packaged products (such as wine) and the decilitre less frequently.The prefix milli-, likewise, may be added to metre to indicate division by one thousand; one millimetre is equal to one thousandth of a metre.Decimal multiplicative prefixes have been a feature of all forms of the metric system, with six dating back to the system's introduction in the 1790s.Hence, The use of prefixes can be traced back to the introduction of the metric system in the 1790s, long before the 1960 introduction of the SI.The prefixes, including those introduced after 1960, are used with any metric unit, whether officially included in the SI or not (e.g., millidynes and milligauss).