A prefix in the metric system denoting a factor of 0.000,000,000,000,000,001 (10^−18): Atto
Atto is formed from the Danish word atten (atten means eighteen).
Examples:
attosecond: An attosecond is a unit of time equal to 10^−18 of a second; i.e. one quintillionth of a second.
attometer: A unit of length equal to 10^−18 metres.
Rem: "attometer" is the US spelling of "attometre".
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