atto-

[From Danish or Norwegian atten, eighteen, from Old Norse āttjān.]

[Etymology: Danish: ‘eighteen’] Symbol a-. (Metric) The 10^-18 multiplier, e.g. 1 attogram = 1 ag = 10^-18 g; contractable to att- before a vowel.

One quintillionth (10^-18): attometer.

Atto can refer to:

Science

• atto-, the SI prefix

People

First name

• Atto of Pistoia, the Italian prelate
• Atto of Vercelli, the bishop of Vercelli
• Adalbert Atto of Canossa

Surname

• Osman Ali Atto, the Somali warlord

it is unit in SI , it is same nano , micro ,..
1 atto = 10^-18

Other

• ATTO Technology, a computer electronics manufacturer

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