Metric prefix
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A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decimal. Each prefix has a unique symbol th
Distance marker on the Rhine at Rüdesheim: 36 (XXXVI) myriametres from Basel. The stated distance is 360 km; the decimal mark in German is a comma.
Kilometre
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The kilometre, spelt kilometer in American English, is a unit of length in the International System of Units, equal to one thousand metres. It is the preferred measurement unit to express distances be
The main span of the 25 de Abril Bridge in Lisbon, Portugal is 1.013 kilometres (1,013 m).