納諾(英語:nano-),簡稱,又譯為[註 1],是一個國際單位制詞頭,符號n,代表10−9 或 0.000 000 001;是科學和電子上經常用的詞頭,例如時間:奈秒(符號:ns)、長度:奈米(符號:nm)或者電容:奈法拉(符號:nF)。

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