What is the origin, the symbol, and the factor of the atto- prefix?

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Quirkie

"atto- (symbol a) is an SI prefix to a unit and means that it is 10^-18 times this unit. Examples are one attosecond or one attometre (U.S. spelling attometer). Adopted in 1964, it comes from the Danish atten, meaning eighteen" From http://en.wikipedia.org/wiki/Atto

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