Reference

Length

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Metric
Kilometer (km)
Meter (m)
Decimeter (dm)
Centimeter (cm)
Millimeter (mm)
British And American
League
Mile (mi)
Furlong (fur)
Chain (ch)
Rod (rd)
Yard (yd)
Foot (ft)
Inch (in)
Nautical
Circle
Sea league
Degree
Sea mile
Cable
Fathom
Typographical
Pica
Point
Astronomical
Parsec
Light year
Astronomical unit (AU)
Light minute
Light second