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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]

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  1. "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-10-06.
  2. "Definition of IOTA". Retrieved 2020-10-06.
  3. "Iota Symbol in Greek Alphabet". Retrieved 2020-10-06.