Atto

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.

Template:SI prefixes

See also

es:Atto fr:Atto it:Atto (prefisso) nl:Atto no:Atto pl:Atto sl:Ato vi:Atô

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