Metric prefixes

standardized prefix of the SI (Système International) for measurement units, indicating a multiple or fraction as a power of 10 or 1000

250px|right|thumb|Distance marker on the Rhine: 36 (XXXVI) myriametres from [[Basel. Note that the stated distance is 360 km; comma is the decimal mark in Germany.]] Myria- is a now obsolete decimal metric prefix denoting a factor of 104 (ten thousand). It originates from the Greek μύριοι (mýrioi) (myriad). The prefix was part of the original metric system adopted by France in 1795, but was not adopted when the SI prefixes were internationally adopted by the 11th CGPM conference in 1960.