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Wikipedia definition
1. Iota subscriptIota subscript in Greek polytonic orthography is a way of writing the letter iota as a small vertical stroke beneath a vowel. It was used in the so-called "long diphthongs" in Ancient Greek, that is, diphthongs the first part of which is a long vowel: ᾳ, ῃ and ῳ. In Latin-based transliteration, it is not usually written. Before the reforms of Eucleides and the adoption of the letters Ω and Η (403-402 BC), there was no way of distinguishing between long and short vowels in Attic Greek.
Read “Iota subscript” on English Wikipedia
Read “下書きのイオータ” on Japanese Wikipedia
Read “Iota subscript” on DBpedia

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