What is the origin, the symbol, and the factor of the zepto- prefix?
by 
Egao No Genki
ANSWERS: 1
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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 or Latin septem, meaning seven, since it is equal to 1/10007. 1000−7 --- 10−21 --- zepto --- z --- Sextillionth Trilliardth --- 0.000 000 000 000 000 000 001
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