The Atto reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Atto

Atto- is a prefix (see all prefixes) to a unit and means that it is 10^-18 times this unit.

Examples are one attosecond or one attometer. The origin of this prefix is the Danish word atten, which means eighteen.

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