Metric		Kilometer (km)
			Meter (m)
			Decimeter (dm)
			Centimeter (cm)
			Micron
			Millimeter (mm)
			Angstrom
			Fermi (fm)
	British And American Old		League
			Mile (mi)
			US statute mile
			Furlong (fur)
			Chain (ch)
			Rod (rd)
			Yard (yd)
			Foot (ft)
			US survey foot
			Inch (in)
	Russian		Verst
			Kosaya sazhen
			Sazhen
			Sea sazhen
			Makhovaya sazhen
			Arshin
			Ell
			Vershok
	Nautical		Circle
			Sea league
			Degree
			Nautical mile
			Cable
			Fathom
	Astronomical		Parsec
			Light year
			Astronomical unit (AU)
			Light minute
			Light second