Prefix  Abbr  Value  Name 
yotta  Y  1 x 10 ^{ 24 }  septillion 
zetta  Z  1 x 10 ^{ 21 }  sextillion 
exa  E  1 x 10 ^{ 18 }  quintillion 
peta  P  1 x 10 ^{ 15 }  quadrillion 
tera  T  1 x 10 ^{ 12 }  trillion 
giga  G  1 x 10 ^{ 9 }  billion 
mega  M  1 x 10 ^{ 6 }  million 
kilo  k  1 x 10 ^{ 3 }  thousand 
hecto  h  1 x 10 ^{ 2 }  hundred 
deka  da  1 x 10 ^{ 1 }  ten 
Factor of One  *******  1 x 10 ^{ 0 }  one 
deci  d  1 x 10 ^{ 1 }  tenth 
centi  c  1 x 10 ^{ 2 }  hundredth 
milli  m  1 x 10 ^{ 3 }  thousandth 
micro  u  1 x 10 ^{ 6 }  millionth 
nano  n  1 x 10 ^{ 9 }  billionth 
pico  p  1 x 10 ^{ 12 }  trillionth 
femto  f  1 x 10 ^{ 15 }  quadrillionth 
atto  a  1 x 10 ^{ 18 }  quintillionth 
zepto  z  1 x 10 ^{ 21 }  sextillionth 
yocto  y  1 x 10 ^{ 24 }  septillionth 


The names of the values (billion, trillion, etc) is the American usage.
Sometimes (especially with capacitors), the prefix "micromicro" is used in place of pico.
The Greek lower case letter 'mu' μ was formerly the abbreviation for 'micro'.
_____________________
