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"И" is a letter from the Cyrillic alphabet, which is used to write Russian, Ukrainian, and several other languages. It represents a vowel sound similar to the "ee" in English words like "see."
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И, from Alexandre Benois' 1904 азбука. I (И и; italics: И и or И и; italics: И и) is a letter used in almost all modern Cyrillic alphabets with the exception of Belarusian, where it is replaced by І.
It commonly represents either the close front unrounded vowel /i/ (e.g., in Russian and Bulgarian), like the pronunciation of ⟨i⟩ in "machine", or the near-close near-front unrounded vowel /ɪ/, (e.g., in Ukrainian), like the pronunciation of ⟨i⟩ in "bin".