Atto (English spelling) atto-
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An SI prefix for 10 -18 (one quintillionth) of a unit. The symbol a comes from the Danish word atten, meaning the number 18. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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単位の 10-18 倍 (100京分の1) を表わすSI 接頭語の1つ。記号はa。デンマーク語で数の 18を意味するアッテン attenに由来する。
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>>: Aden - Aden (English spelling)
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