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Common (black) and uncommon (grey) SI unit prefixes.
Prefix |
Meaning |
Abbreviation |
Exponential
Notation |
Yotta- |
septillion |
Y |
1024 |
Zetta- |
hexillion |
Z |
1021 |
Exa- |
quintillion |
E |
1018 |
Peta- |
quadrillion |
P |
1015 |
Tera- |
trillion |
T |
1012 |
Giga- |
billion |
G |
109 |
Mega- |
million |
M |
106 |
kilo- |
thousand |
k |
103 |
hecto- |
hundred |
h |
102 |
deka- |
ten |
da |
101 |
deci- |
tenths of |
d |
10-1 |
centi- |
hundredths of |
c |
10-2 |
milli- |
thousandths of |
m |
10-3 |
micro- |
millionths of |
µ |
10-6 |
nano- |
billionths of |
n |
10-9 |
pico- |
trillionths of |
p |
10-12 |
femto- |
quadrillionths of |
f |
10-15 |
atto- |
quintillionths of |
a |
10-18 |
zepto- |
hexillionths of |
z |
10-21 |
yocto- |
septillionths of |
y |
10-24 |
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