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Eta / /, EE-tə, AY-tə (uppercase Η, lowercase η; Ancient Greek: ἦτα ē̂ta [ɛ̂ːta] or Greek: ήτα ita [ˈita]) is the seventh letter of the Greek alphabet, representing the close front unrounded vowel IPA: [i]. Originally denoting the voiceless glottal fricative IPA: [h] in most dialects, its sound value in the classical Attic dialect of Ancient Greek was a long open-mid front unrounded vowel IPA: [ɛː], raised to IPA: [i] in hellenistic Greek, a process known as iotacism or itacism.
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In the ancient Attic number system (Herodianic or acrophonic numbers), the number 100 was represented by "Η", because it was the initial of ΗΕΚΑΤΟΝ, the ancient spelling of ἑκατόν = "one hundred". In the later system of (Classical) Greek numerals eta represents 8.
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