# Iota

(Redirected from Iota (letter))

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 ${\displaystyle \iota }$ 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]

## References

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