Multiply by: For: Power: Symbol:
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1,000,000,000,000,000,000,000,000 yotta 24 Y
1,000,000,000,000,000,000,000 zetta 21 Z
1,000,000,000,000,000,000 exa 18 E
1,000,000,000,000,000 peta 15 P
1,000,000,000,000 tera 12 T
1,000,000,000 giga 9 G
1,000,000 mega 6 M
1,000 kilo 3 k
100 hecto 2 h
10 deka 1 da
.1 deci -1 d
.01 centi -2 c
.00,1 milli -3 m
.00,000,1 micro -6 u (mu)
.00,000,000,1 nano -9 n
.00,000,000,000,1 pico -12 p
.00,000,000,000,000,1 femto -15 f
.00,000,000,000,000,000,1 atto -18 a
.00,000,000,000,000,000,000,1 zepto -21 z
.00,000,000,000,000,000,000,000,1 yocto -24 y
One "attoboy" sure isn't worth much!
The items in the "Symbol" colum were taken from http://www.pen.k12.va.us/Anthology/Div/Winchester/jhhs/math/facts/numnotat.html.
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