1. atto-; 10^-18
2. Atto-Atto- (symbol a) is a prefix in the metric system denoting a factor of 10 or 0.000000000000000001. The unit multiple was adopted at the 11th Conférence Générale des Poids et Mesures (CGPM) in Resolution 12, paragraph 3. It is derived from the Danish word atten, meaning "eighteen".
Read “Atto-” on English Wikipedia
Read “アト” on Japanese Wikipedia
Read “Atto-” on DBpedia
Read “Atto-” on English Wikipedia
Read “アト” on Japanese Wikipedia
Read “Atto-” on DBpedia
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