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Iota
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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
History
Ϝϝ Digamma Ͱͱ Heta
Ϻϻ San Ϙϙ Qoppa
Ͷͷ
Ͳͳ Sampi
Ϸϸ Sho
Diacritics and other symbols
Related topics

Iota (/aɪˈoʊtə/ ⓘ;[1] /ˈjota/, uppercase Ι, lowercase ι; Greek: ιώτα) is the ninth letter of the Greek alphabet. It was derived from the Phoenician letter Yodh.[2] Letters that arose from this letter include the Latin I and J, the Cyrillic І (І, і), Yi (Ї, ї), and Je (Ј, ј), and iotated letters (e.g. Yu (Ю, ю)). In the system of Greek numerals, iota has a value of 10.[3]

Iota represents the close front unrounded vowel IPA: [i]. In early forms of ancient Greek, it occurred in both long [iː] and short [i] versions, but this distinction was lost in Koine Greek.[4] 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. Examples include ᾼ ᾳ ῌ ῃ ῼ ῳ. The former diphthongs became digraphs for simple vowels in Koine Greek.[4]

The word is used in a common English phrase, "not one iota", meaning "not the slightest amount". This refers to iota, the smallest letter, or possibly yodh, י, the smallest letter in the Hebrew alphabet.[5][6] The English word jot derives from iota.[7] The German, Polish, Portuguese, and Spanish name for the letter J (Jot / jota) is derived from iota.

Uses

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Unicode

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For accented Greek characters, see Greek diacritics: Computer encoding.

  • U+0196 Ɩ LATIN CAPITAL LETTER IOTA
  • U+0269 ɩ LATIN SMALL LETTER IOTA
  • U+0345 ͅ COMBINING GREEK YPOGEGRAMMENI
  • U+037A ͺ GREEK YPOGEGRAMMENI
  • U+038A Ί GREEK CAPITAL LETTER IOTA WITH TONOS
  • U+0390 ΐ GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
  • U+0399 Ι GREEK CAPITAL LETTER IOTA (Ι)
  • U+03AA Ϊ GREEK CAPITAL LETTER IOTA WITH DIALYTIKA
  • U+03AF ί GREEK SMALL LETTER IOTA WITH TONOS
  • U+03B9 ι GREEK SMALL LETTER IOTA (ι) (\iota in TeX)
  • U+03CA ϊ GREEK SMALL LETTER IOTA WITH DIALYTIKA
  • U+1D7C ᵼ LATIN SMALL LETTER IOTA WITH STROKE
  • U+1DA5 ᶥ MODIFIER LETTER SMALL IOTA
  • U+1FBE ι GREEK PROSGEGRAMMENI
  • U+2129 ℩ TURNED GREEK SMALL LETTER IOTA (℩)
  • U+2373 ⍳ APL FUNCTIONAL SYMBOL IOTA
  • U+2378 ⍸ APL FUNCTIONAL SYMBOL IOTA UNDERBAR
  • U+2C92 Ⲓ COPTIC CAPITAL LETTER IAUDA
  • U+2C93 ⲓ COPTIC SMALL LETTER IAUDA
  • U+A646 Ꙇ CYRILLIC CAPITAL LETTER IOTA
  • U+A647 ꙇ CYRILLIC SMALL LETTER IOTA
  • U+1D6B0 𝚰 MATHEMATICAL BOLD CAPITAL IOTA[a]
  • U+1D6CA 𝛊 MATHEMATICAL BOLD SMALL IOTA
  • U+1D6EA 𝛪 MATHEMATICAL ITALIC CAPITAL IOTA
  • U+1D704 𝜄 MATHEMATICAL ITALIC SMALL IOTA
  • U+1D724 𝜤 MATHEMATICAL BOLD ITALIC CAPITAL IOTA
  • U+1D73E 𝜾 MATHEMATICAL BOLD ITALIC SMALL IOTA
  • U+1D75E 𝝞 MATHEMATICAL SANS-SERIF BOLD CAPITAL IOTA
  • U+1D778 𝝸 MATHEMATICAL SANS-SERIF BOLD SMALL IOTA
  • U+1D798 𝞘 MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL IOTA
  • U+1D7B2 𝞲 MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL IOTA
  1. ^ The MATHEMATICAL symbols are only for use in math. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Iota

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from Grokipedia
Iota (/aɪˈoʊtə/; uppercase Ι, lowercase ι; Greek: ἰῶτα [iˈo̞ta]) is the ninth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 10. Iota has been transliterated into the Latin alphabet as the letter I.

Etymology and History

Origins in Phoenician Script

The letter iota traces its origins to the Phoenician letter yodh (𐤉), the tenth character in the Phoenician abjad, which represented a hand or arm and primarily denoted the consonantal sound /j/, akin to the "y" in "yes." This symbol evolved from earlier Semitic writing systems, with its approximate attestation in the Proto-Canaanite script dating to the 11th century BCE, as seen in inscriptions from Canaanite contexts. The yodh form developed through the intermediary Proto-Sinaitic script, a consonantal system derived from Egyptian hieroglyphs around the mid-2nd millennium BCE, where it stylized the hieroglyph for "hand" (Egyptian ḏrt). One of the earliest clear examples of the Phoenician yodh appears in the Ahiram sarcophagus inscription from Byblos, Lebanon, dated to circa 1000 BCE, where it features as a simple vertical stroke in the name Ytbʿl (Ittobaal) and other elements of the dedicatory text. This artifact, discovered in 1923, provides key evidence of the script's maturation, with the yodh maintaining a linear, arm-like silhouette characteristic of Semitic forms. In Semitic languages, yodh functioned as a weak consonant, often serving as a semi-vowel /j/ that could assimilate or shift in morphological contexts, such as in verb roots or as a mater lectionis for vowels. This inherent flexibility as a glide consonant facilitated its adaptation into the Greek alphabet, where it transitioned to represent the vowel /i/, becoming iota by the 8th century BCE.

Development in Archaic and Classical Greek

The Greek letter iota was adopted around the 8th century BCE as part of the standardization of the Greek alphabet, derived from the Phoenician letter yodh, which originally represented a consonantal glide but was repurposed in Greek for the vowel sound /i/ due to the loss of the /j/ phoneme in the language. This adaptation occurred during the Geometric Period, when Greek speakers, likely through trade contacts in regions like Euboea, transformed the consonantal Phoenician script into the first true alphabet by assigning values to five letters for vowels, including yodh as iota. In archaic Greek writing, iota's form evolved from angular, yodh-like shapes resembling a crooked or slanted stroke (ϟ) in early local scripts, such as the "Cretan" variants on Crete and Thera around 900–800 BCE, to a straighter upright bar (Ι) in eastern Greek traditions by the late 8th century. This shift helped distinguish it from emerging forms of sigma (Σ), avoiding confusion in inscriptions; by the 5th century BCE in Attic script, iota had standardized as a simple vertical stroke, often rendered with slight curvature in monumental epigraphy for aesthetic reasons. Early inscriptions demonstrate iota's role as a dedicated vowel letter, marking a key innovation from its Phoenician precursor. For instance, the Dipylon Oinochoe from Athens (c. 740 BCE), one of the oldest Greek alphabetic texts, features iota with a three-stroked form in a hexametric verse, used to represent /i/ in words like "ὅς" (hos, "who"), illustrating its vocalic function in poetic and competitive contexts without residual consonantal use. Dialectal variations influenced iota's shape and standardization during the classical era, with Ionic scripts in eastern Greece (e.g., Eretria and Methone, late 8th–early 7th century BCE) favoring the upright form for clarity in vowel notation, while Doric regions retained more angular variants longer before converging on the Ionian model. This Ionic dominance, adopted officially in Athens by 403 BCE, solidified iota's uniform vertical glyph across most Greek poleis, facilitating pan-Hellenic literacy and textual transmission.

Usage in the Greek Alphabet

Pronunciation and Phonetics

In Classical Attic Greek (c. 5th–4th century BCE), iota (ι) represented the close front unrounded vowel /i/, occurring in both short and long [iː] forms, distinct from its Proto-Indo-European origin as a semivowel glide /j/ that had fully vocalized by this period. This pronunciation is evident in words like ἰδέ (see), where the short iota provides a high front vowel sound akin to the "i" in English "machine" for the long form or "bit" for the short. During the Koine Greek era (c. 300 BCE–300 CE), iota retained its /i/ value, but significant phonetic shifts occurred, including the monophthongization of diphthongs like ει (formerly /ei/) to a simple /i/, resulting in a merger where ει, η, and ι all converged on this sound. This itacism, or iotacism, simplified the vowel system and is reflected in texts from this period, such as the New Testament, where diverse spellings produced identical /i/ realizations. In standard Modern Demotic Greek, iota continues to be pronounced as the close front unrounded vowel /i/, consistent with its Koine heritage and without length distinction. Regional variations include reduction or elision of unstressed /i/ in northern dialects. In standard and many dialects, iota before certain vowels (e.g., α, ο) functions as a semivowel /j/, as in ια pronounced /ja/. Throughout its history, iota's core sound is denoted in the International Phonetic Alphabet (IPA) as /i/ when isolated. For instance, in Homer's Iliad (c. 8th century BCE, reflecting early epic Greek close to Attic norms), the initial iota in the title Ἰλιάς is rendered as /iˈli.as/, emphasizing the vowel's prominence in poetic meter and recitation.

Glyphs, Forms, and Diacritics

The uppercase form of iota, denoted as Ι, is a simple vertical stroke resembling a block-like majuscule, derived from the Phoenician yod and standardized in the classical Greek alphabet by the 4th century BCE. The lowercase iota, ι, typically appears as a straight or slightly curved vertical stroke in uncial scripts, often with a subtle hook or descender at the bottom in later minuscule hands to distinguish it from similar letters like nu. In archaic Greek inscriptions from the 8th to 6th centuries BCE, iota exhibited regional variants beyond the classical straight stroke, including crooked or angular forms with multiple strokes—such as S-shaped or reverse-Z configurations—in local epichoric alphabets like those of Crete and Corinth. These contrasted with the looped or curved precursors in some early Phoenician influences, though the straight vertical form predominated by the classical period. During the Byzantine era (4th–12th centuries CE), uncial and emerging minuscule scripts adapted iota into more fluid cursive variants, where it could appear elongated or connected in book hands, facilitating faster writing in manuscripts. A key diacritic modification is the iota subscript (ͅ), a small iota placed below alpha (ᾳ), eta (ῃ), or omega (ῳ) to denote historical long diphthongs ending in /iː/, which had merged phonetically by late antiquity. This convention was invented by 12th-century Byzantine philologists as an editorial tool to preserve etymological spelling in classical texts, marking positions where an adscript iota had been omitted in pronunciation. The subscript was retained in polytonic Greek orthography until the 1982 reform, which introduced monotonic spelling and abolished it along with other historical diacritics to simplify modern writing. In ancient papyri from Oxyrhynchus (1st–3rd centuries CE), adscript iota appears in 91 of 194 analyzed letters, often in dative forms and greetings. Ligatures involving iota, such as in diphthongs αι and ει, were common for writing efficiency in documentary and literary fragments.

Mathematical and Scientific Notation

Symbolic Uses in Mathematics

In 18th-century mathematical notation, Leonhard Euler utilized the symbol i—closely resembling the Greek lowercase iota (ι)—to denote the imaginary unit −1\sqrt{-1}
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