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Decimal System Prefixes

Prefix names of multiples and submultiples of units

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Decimal multiples of units:

PrefixMeasureDecimal equivalentExponential
expression
y - yocto   0.000 000 000 000 000 000 000 001 E-24
z - zepto   0.000 000 000 000 000 000 001 E-21
a - atto one-quintillionth 0.000 000 000 000 000 001 E-18
f - femto one-quadrillionth 0.000 000 000 000 001 E-15
p - pico one-trillionth 0.000 000 000 001 E-12
n - nano one-billionth 0.000 000 001 E-9
μ - micro one-millionth 0.000 001 E-6
m - milli one-thousandth 0.001 E-3
c - centi one-hundredth 0.01 E-2
d - deci one-tenth 0.1 E-1
Uni one 1 E0
d - deka ten 10 E1
h - hecto one hundred 100 E2
k - kilo one thousand 1 000 E3
M - mega one million 1 000 000 E6
G - giga one billion 1 000 000 000 E9
T - tera one trillion 1 000 000 000 000 E12
P - peta   1 000 000 000 000 000 E15
E - exa   1 000 000 000 000 000 000 E18
Z - zetta   1 000 000 000 000 000 000 000 E21
Y - yotta   1 000 000 000 000 000 000 000 000 E24
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