Iota (uppercase
Ι, lowercase
ι; ) is the ninth letter of the
Greek alphabet. It was derived from the Phoenician letter
Yodh. Letters that arose from this letter include the
Latin I and
J and the
Cyrillic І (І, і),
Yi (Ї, ї),
Je (Ј, ј), and
iotated letters (e.g.
Yu (Ю, ю)). In the system of
Greek numerals iota has a value of 10.