Iota
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For other uses, see Iota (disambiguation).
Iota (uppercase/lowercase Ι ι), is the letter of the Greek alphabet, used to represent the "i" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 10. Letters that came from it include the Roman I and Cyrillic І.
In mathematics, the lowercase is used to represent the inclusion function in set theory.[1] The term "iota" is also used to refer to an infinitesimal amount or an insignificant quantity.[2][3]