Decimal System Prefixes
Prefix names used for multiples and submultiples units.
Decimal multiples of units:
Prefix  Measure  Decimal equivalent  Exponential expression 

y  yocto  0.000 000 000 000 000 000 000 001  E^{24}  
z  zepto  0.000 000 000 000 000 000 001  E^{21}  
a  atto  onequintillionth  0.000 000 000 000 000 001  E^{18} 
f  femto  onequadrillionth  0.000 000 000 000 001  E^{15} 
p  pico  onetrillionth  0.000 000 000 001  E^{12} 
n  nano  onebillionth  0.000 000 001  E^{9} 
μ  micro  onemillionth  0.000 001  E^{6} 
m  milli  onethousandth  0.001  E^{3} 
c  centi  onehundredth  0.01  E^{2} 
d  deci  onetenth  0.1  E^{1} 
Uni  one  1  E^{0} 
d  deka  ten  10  E^{1} 
h  hecto  one hundred  100  E^{2} 
k  kilo  one thousand  1 000  E^{3} 
M  mega  one million  1 000 000  E^{6} 
G  giga  one billion  1 000 000 000  E^{9} 
T  tera  one trillion  1 000 000 000 000  E^{12} 
P  peta  1 000 000 000 000 000  E^{15}  
E  exa  1 000 000 000 000 000 000  E^{18}  
Z  zetta  1 000 000 000 000 000 000 000  E^{21}  
Y  yotta  1 000 000 000 000 000 000 000 000  E^{24} 
Prefixes used in the SI system.
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