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Familiar unit but not an international standard

Symbol: L / Base data: SI Combined units. 1L=1dm3

Originated in France

Litre is, in fact, not an international unit, but, its use with other SI units is recognized. It originated in France. When the metric system was established, it was defined as 1 dm (= 10 cm) x 1 m x 1 dm. A carton of milk is measured in litres, so it is a familiar volume unit.