Factor |
Prefix |
Symbol |
Factor |
Prefix |
Symbol |
1024 |
yotta |
Y |
10-1 |
deci |
d |
1021 |
zetta |
Z |
10-2 |
centi |
c |
1018 |
exa |
E |
10-3 |
milli |
m |
1015 |
peta |
P |
10-6 |
micro |
µ |
1012 |
tera |
T |
10-9 |
nano |
n |
109 |
giga |
G |
10-12 |
pico |
p |
106 |
mega |
M |
10-15 |
femto |
f |
103 |
kilo |
k |
10-18 |
atto |
a |
102 |
hecto |
h |
10-21 |
zepto |
z |
101 |
deca |
da |
10-24 |
yocto |
y |
Where a derived unit is expressed as a fraction, its decimal multiples and submultiples may be designated by attaching a prefix to units in the numerator or the denominator, or in both these parts.
Compound prefixes, that is to say prefixes formed by the juxtaposition of several of the above prefixes, may not be used.