The second [ s ]
And the multiples or decimal fractions afforded by the SI prefix system:
yotta Y 1000000000000000000000000
zetta Z 1000000000000000000000
exa E 1000000000000000000
peta P 1000000000000000
tera T 1000000000000
giga G 1000000000
mega M 1000000
kilo k 1000
[hecto h 100] Not in the SI system but used in every day affairs)
(none) (none) 1
[deci d 0.1] Not in the SI system but used in every day affairs)
[centi c 0.01] Not in the SI system but used in every day affairs)
milli m 0.001
micro μ 0.000001
nano n 0.000000001
pico p 0.000000000001
femto f 0.000000000000001
atto a 0.000000000000000001
zepto z 0.000000000000000000001
yocto y 0.000000000000000000000001
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kilometres
The SI unit for measuring weight (the force due to gravity) is the newton.The SI unit for measuring mass is the kilogram.
kilometers
The metre.