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Length
meter
exameter
petameter
terameter
gigameter
megameter
kilometer
hectometer
dekameter
decimeter
centimeter
millimeter
micrometer
nanometer
picometer
femtometer
attometer
megaparsec
kiloparsec
parsec
light year
astronomical unit
MIL
nautical league (international)
nautical league (UK)
league (US)
nautical mile (UK)
nautical mile (international)
mile
mile (based on US survey foot)
mile (Roman)
kiloyard
furlong
furlong (based on US survey foot)
chain
chain (based on US survey foot)
rod
rod (based on US survey foot)
perch
pole
fathom
fathom (based on US survey foot)
yard
foot
foot (US survey)
link
link (based on US survey foot)
hand
nail
inch
mil
microinch
angstrom
X-unit
fermi
arpent
pica
point
twip
aln
famn
caliber
ken
barleycom
Russian archin
Roman actus
cloth nail
cloth span
vara de tarea
vara conuquera
vara castellana
cubit (Greek)
long reed (Biblical)
reed (Biblical)
cubit (Biblical)
long cubit (Biblical)
span (Biblical)
handbreadth (Biblical)
fingerbreadth (Biblical)
Planck length
Electron radius (classical)
Bohr radius
Earth's equatorial radius
Earth's polar radius
Earth's distance from sun
Sun's radius