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Iota uc lc.svg
Greek alphabet
Αα Alpha Νν Nu
Ββ Beta Ξξ Xi
Γγ Gamma Οο Omicron
Δδ Delta Ππ Pi
Εε Epsilon Ρρ Rho
Ζζ Zeta Σσς Sigma
Ηη Eta Ττ Tau
Θθ Theta Υυ Upsilon
Ιι Iota Φφ Phi
Κκ Kappa Χχ Chi
Λλ Lambda Ψψ Psi
Μμ Mu Ωω Omega
Obsolete letters
Digamma uc lc.svg Digamma Qoppa uc lc.svg Qoppa
San uc lc.svg San Sampi uc lc.svg Sampi
Other characters
Stigma uc lc.svg Stigma Sho uc lc.svg Sho
Heta uc lc.svg Heta

Greek diacritics

Iota (uppercase Ι, lowercase ι; Greek: Ιώτα [jɒta] Yota/Jota) the ninth letter of the Greek alphabet. In the system of Greek numerals it has a value of 10. It was derived from the Phoenician letter Yodh (Phoenician yodh.png). Letters that arose from this letter include the Roman I and J and the Cyrillic І (І, і), Yi (Ї, ї), Je (Ј, ј), and iotified letters (e.g. Yu (Ю, ю)).

Iota represents [i]. In ancient Greek it occurred in both long [iː] and short [i] versions, but this distinction has been lost in Modern Greek.

Iota participated as the second element in falling diphthongs, with both long and short vowels as the first element. Where the first element was long, the iota was lost in pronunciation at an early date, and was written in polytonic orthography as iota subscript in other words as a very small ι under the main vowel, for instance ᾼ ᾳ ῌ ῃ ῼ ῳ

The word is used in a common English phrase, 'not one iota', meaning 'not the slightest difference', in reference to a phrase in the New Testament: "until heaven and earth pass away, not an iota, not a dot, will pass from the Law" (Mt 5:18).[1]



  1. ^ Ammer, Christine (1997). The American Heritage Dictionary of Idioms. p. 445. 


Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also iota


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Iota n. (genitive Iota or Iotas, plural Iotas)

  1. Alternative spelling of Jota.

Simple English

Iota is the ninth letter of the Greek alphabet.

Iota could also mean:

  • Latin iota (Ɩ), a letter of the Latin alphabet
  • Iota, Louisiana, a town in Louisiana, United States
  • Iota and Jot, two esoteric programming languages
  • International Occultation Timing Association (IOTA)


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