GL F IIA2.1.3 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.

Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/f_iia2_1_3.htm

Date retrieved: 17 May 2021

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EPO Guidelines - F The European Patent Application