1. SI units and their decimal multiples and submultiples
1.3 Prefixes and their symbols used to designate certain decimal multiples and submultiples
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 |
The names and symbols of the decimal multiples and submultiples of the unit of mass are formed by attaching prefixes to the word "gram" and their symbols to the symbol "g".
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.