Zepto

Zepto (symbol z) is a prefix in the SI system of units denoting a factor of 10-21.

Adopted in 1991, it comes from the French sept, meaning seven, since it is equal to 1/10007.

See also

SI prefix


SI Prefixes

Edit (http://www.askfactmaster.com/Template:SI_prefix)

(Sub)multiple Prefix Symbol Short scale Name Long scale Name
1024 yotta Y Septillion Quadrillion
1021 zetta Z Sextillion Thousand trillion (Trilliard)
1018 exa E Quintillion Trillion
1015 peta P Quadrillion Thousand billion (Billiard)
1012 tera T Trillion Billion
109 giga G Billion Thousand million (Milliard)
106 mega M Million
104 (obsolete) myria ma Ten thousand
103 kilo k Thousand
102 hecto h Hundred
101 deca da Ten
10-1 deci d Tenth
10-2 centi c Hundredth
10-3 milli m Thousandth
10-6 micro µ Millionth
10-9 nano n Billionth Milliardth
10-12 pico p Trillionth Billionth
10-15 femto f Quadrillionth Billiardth
10-18 atto a Quintillionth Trillionth
10-21 zepto z Sextillionth Trilliardth
10-24 yocto y Septillionth Quadrillionth


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