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Cyrillic letter I
Cyrillic numerals: 8
Unicode (hex)
majuscule: U+0418
minuscule: U+0438
Cyrillic alphabet
А	Б	В	Г	Ґ	Д	Ѓ
Ђ	Е	Ѐ	Ё	Є	Ж	З
Ѕ	И	Ѝ	І	Ї	Й	Ј
К	Л	Љ	М	Н	Њ	О
П	Р	С	Т	Ћ	Ќ	У
Ў	Ф	Х	Ц	Ч	Џ	Ш
Щ	Ъ	Ы	Ь	Э	Ю	Я
Non-Slavic letters
Ӑ	Ӓ	Ә	Ӛ	Ӕ	Ғ	Ӷ
Ҕ	Ӗ	Ҽ	Ҿ	Ӂ	Җ	Ӝ
Ҙ	Ӟ	Ӡ	Ӥ	Ӣ	Ӏ	Ҋ
Қ	Ҟ	Ҡ	Ӄ	Ҝ	Ӆ	Ӎ
Ҥ	Ң	Ӊ	Ӈ	Ӧ	Ө	Ӫ
Ҩ	Ҧ	Ҏ	Ҫ	Ҭ	Ӳ	Ӱ
Ӯ	Ү	Ұ	Ҳ	Һ	Ҵ	Ӵ
Ҷ	Ӌ	Ҹ	Ӹ	Ҍ	Ӭ
Archaic letters
Ҁ	Ѹ	Ѡ	Ѿ	Ѻ	Ѣ	ІА
Ѥ	Ѧ	Ѫ	Ѩ	Ѭ	Ѯ	Ѱ
Ѳ	Ѵ	Ѷ
List of Cyrillic letters

I or Y (И, и) is a letter in the Cyrillic alphabet, representing /i/ in Russian and /ɪ/ in Ukrainian. It is derived from the Greek letter eta (Η, η representing [ɛː] in Ancient Greek and [i] in Modern Greek).

In the early Cyrillic alphabet there was little or no distinction between the letters И (izhe) and І (i), descended from the Greek letters Η (eta) and Ι (iota). They both remained in the alphabetical repertoire because they represented different numbers in the Cyrillic numeral system, eight and ten, and are therefore sometimes referred to as octal I and decimal I.

It is the tenth letter of the Russian alphabet, and in Russian it represents /i/, like the i in machine. Although in isolation it is not preceded by the /j/ semivowel like other "soft" vowels (е, ё, ю, and я), in Russian it is considered the soft counterpart to ы, which represents [ɨ], because it denotes a preceding soft consonant. In Ukrainian and Belarusian, the sound /i/ is represented by the letter і, sometimes called Ukrainian I.

The letter и is the eleventh letter of the Ukrainian alphabet.

Belarusian has dispensed entirely with the letter и.

With a breve, it forms the letter й, called I kratkoye ("short I") in Russian, similarly I kratko in Bulgarian, or Yot in Ukrainian and it represents the y in English "yes."

It is transliterated from Russian as i, or from Ukrainian as y or i, using different romanization systems. See romanization of Russian and romanization of Ukrainian.

Originally, Cyrillic И, и had the shape identical to Greek uppercase Η or Latin uppercase H. Later, the middle stroke turned counterclockwise which made the modern form similar to the mirrored Latin alphabet's capital N (this is why И is used in faux Cyrillic typography). But style of the two letters is not fully identical: in Roman-type fonts, И has serifs on all four corners, whereas N only on bottom-left and top-right ones; also, И has (contrarily to N) thicker vertical lines than the diagonal one. Lowercase и in regular fonts has the same shape as uppercase И. In italic (cursive) fonts, lowercase и may look like Latin u. In handwritten (calligraphic) fonts, both lower- and uppercase forms of и have usually the shape of handwritten Latin lowercase u.

• Eta (letter)
• Iota