
Your RF Cafe

These are the commonly used numerical prefixes in the English language, but most seem to translate with European languages.
Mathematical  
Prefix  Symbol  Name  Multiplier 
vendeko  v  decillionth  10^{33} 
nonillionth  10^{30}  
xenno  x  octillionth  10^{27} 
yocto  y  septillionth  10^{24} 
zepto  z  sextillionth  10^{21} 
atto  a  quintillionth  10^{18} 
femto  f  quadrillionth  10^{15} 
pico  p  trillionth  10^{12} 
nano  n  billionth  10^{9} 
micro  µ  millionth  10^{6} 
milli  m  thousandth  10^{3} 
centi  c  hundredth  10^{2} 
deci  d  tenth  10^{1} 
deka  da  ten  10^{1} 
hecto  h  hundred  10^{2} 
kilo  k  thousand  10^{3} 
mega  M  million  10^{6} 
giga  G  billion^{†}  10^{9} 
tera  T  trillion^{†}  10^{12} 
peta  P  quadrillion  10^{15} 
exa  E  quintillion  10^{18} 
zetta  Z  sextillion  10^{21} 
yotta  Y  septillion  10^{24} 
xenna  X  octillion  10^{27} 
V  nonillion  10^{30}  
vendeka  V  decillion  10^{33} 
undecillion  10^{36}  
duodecillion  10^{39}  
tredecillion  10^{42}  
quattodecillion  10^{45}  
quindecillion  10^{48}  
sexdecillion  10^{51}  
septendecillion  10^{54}  
octodecillion  10^{57}  
novemdecillion  10^{60}  
vigindecillion  10^{63}  
googol  10^{100}  
googolplex  10^{google} 
Digital (Base 2)  
Prefix  Symbol  Multiplier  Value 
peta  P  2^{50}  1,125,899,906,842,624 
tera  T  2^{40}  1,099,511,627,776 
giga  G  2^{30}  1,073,741,824 
Mega  M  2^{20}  1,048,576 
kilo  k  2^{10}  1,024 
IEC Version  
Prefix  Symbol  Multiplier  Value 
exbi  Ei  2^{60}  1,152,921,504,606,846,976 
pebi  Pi  2^{50}  1,125,899,906,842,624 
tebi  Ti  2^{40}  1,099,511,627,776 
gibi  Gi  2^{30}  1,073,741,824 
mebi  Mi  2^{20}  1,048,576 
kibi  Ki  2^{10}  1,024 
NonTechnical Writing  
Prefix  Value 
uni, mono  1 
bi  2 
tri  3 
quadr  4 
quint, penta  5 
hex, sex  6 
hept, sept  7 
octo  8 
novem  9 
deca, deka  10 
† 1,000,000,000 is called "one billion" in the U.S., U.K., France (before May 3, 1961), Brazil, Puerto Rico, Greece, and in Italy, Russia and Turkey it is referred to as "one billion" when written out, but as "one milliard" when written as 10^{9}. 1,000,000,000,000 is called "one trillion" in the U.S., but is called "one billion" in Germany, the Netherlands, Austria, Sweden, Norway, Denmark, Finland, France (after May 3, 1961), Portugal, Poland. It is best to check for current definitions for each country to be certain to get it right, or better yet, just write it out numerically to avoid confusion.
Thanks to Duncan for the zepto info.