iota
noun uk/aɪˈəʊ.tə/ us/aɪˈoʊ.t̬ə/
(small amount)
[ S ]极少量
an extremely small amount
I haven't seen one iota of evidence to support his claim. 我没有看到任何可以支持他的说法的证据。
(letter)
[ C or U ] language, mathematics, science (symbol I, ι)（希腊语字母表的第九个字母）
the ninth letter of the Greek alphabet