Esta página es sobre la letra griega iota. Para la letra del alfabeto latino representada con un glifo similar ver I o J. Iota (Ι ι) es la novena letra del alfabeto griego y tiene un valor de 10 (ιʹ) en el sistema de numeración griega. La palabra iota es usada en inglés y en francés para expresar pequeñas cantidades. Según algunos relatos su uso proviene de una disputa teológica del siglo III y IV de la doctrina arriana de que Jesús (Hijo) y el Dios (Padre) eran naturalezas distintas pero similares, en griego homoi-ousios, contra la doctrina ortodoxa para la cual eran una misma naturaleza, en griego homo-ousios. Las dos palabras difieren únicamente en una iota.

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Iota /aɪˈoʊtə/ (uppercase Ι, lowercase ι; Greek: Ιώτα) 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. Iota represents the sound [i]. In ancient Greek it occurred in both long [iː] and short [i] versions, but this distinction was lost in Koine 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 former diphthongs became digraphs for simple vowels in Koine Greek. The word is used in a common English phrase, 'not one iota', meaning 'not the slightest amount', in reference to a phrase in the New Testament (Matthew 5:18): "until heaven and earth pass away, not an iota, not a dot, (King James Version: '[not] one jot or one tittle') will pass from the Law until all is accomplished." (Mt 5:18) This refers to iota, the smallest letter, or possibly Yodh, י, the smallest letter in the Hebrew alphabet. The word 'jot' (or iot) derives from iota. The German, Portuguese and Spanish name for the letter J (Jot / jota) is derived from iota.

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