length unit prefixed metre unit 単位 Birmingham gauge French gauge angstrom ångström astronomical unit chain cicero cicero fathom (US survey) fermi fermi foot (international) 英尺（国际） foot (US survey) furlong (international) gigaparsec gigaparsec inch (international) 英寸（国际） kiloparsec kiloparsec light year lichtjaar megaparsec megaparsec metre meter 米 micron micron mil (length) mile (statute) mile (US survey) nautical mile (international) zeemijl (internationaal) 海里（国际） parsec pica (ATA) pica (Postscript) pica (TeX) point (ATA) point (Didot) point (Postscript) point (TeX) rod (US) solar radius yard (international) 码（国际）