Yeru or Eru (Ы ы; italics: Ы ы), usually called Y [ɨ] in modern Russian or Yery or Ery historically and in modern Church Slavonic, is a letter in the Cyrillic script. It represents the close central unrounded vowel /ɨ/ (more rear or upper than i) after non-palatalised (hard) consonants in the Belarusian and Russian alphabets, and after any consonant in most of Rusyn standards, where it represents the unrounded close-mid back unrounded vowel sound.

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Quick Facts Cyrillic letter Yery, Phonetic usage: ...

Cyrillic letter Yery
Phonetic usage:	[ɨ] [ɯ] [ə] [ɤ]
The Cyrillic script
Slavic letters
А А̀ А̂ А̄ Ӓ Б В Г Ґ Д Ђ Ѓ Е Ѐ Е̄ Е̂ Ё Є Ж З З́ Ѕ И І Ї Ꙇ Ѝ И̂ Ӣ Й Ј К Л Љ М Н Њ О О̀ О̂ Ō Ӧ П Р С С́ Т Ћ Ќ У У̀ У̂ Ӯ Ў Ӱ Ф Х Ц Ч Џ Ш Щ Ꙏ Ъ Ъ̀ Ы Ь Ѣ Э Ю Ю̀ Я Я̀
Non-Slavic letters
Ӑ А̊ А̃ Ӓ̄ Ӕ Ә Ә́ Ә̃ Ӛ В̌ Ԝ Г̑ Г̇ Г̣ Г̌ Г̂ Г̆ Г̈ Ҕ Ғ Ӻ Ғ̌ Ӷ Д́ Д̌ Д̈ Д̣ Д̆ Ӗ Е̃ Ё̄ Є̈ Ԑ Ԑ̈ Җ Ӝ Ӂ Ж̣ Ҙ Ӟ З̌ З̣ З̆ Ӡ И̃ Ӥ Ҋ Қ Ӄ Ҡ Ҟ Ҝ К̣ Ԛ ᴫ Л́ Ӆ Ԯ Ԓ Л̈ Ӎ ᵸ Н́ Ӊ Ң Ԩ Ӈ Ҥ О̆ О̃ Ӧ̄ Ө Ө̄ Ө́ Ө̆ Ӫ Ԥ П̈ Ҏ Р̌ С̌ Ҫ С̣ С̱ Т́ Т̈ Т̌ Т̇ Т̣ Ҭ У̃ Ӳ У̊ Ӱ̄ Ұ Ү Ү́ Х̣ Х̱ Х̮ Х̑ Х̌ Ҳ Ӽ Ӿ Һ Һ̈ Ԧ Ц̌ Ц̈ Ҵ Ҷ Ҷ̣ Ӵ Ӌ Ҹ Ч̇ Ч̣ Ҽ Ҿ Ш̈ Ш̣ ꚜ Ы̆ Ы̄ Ӹ ꚝ Ҍ Ҩ Э̆ Э̄ Э̇ Ӭ Ӭ́ Ӭ̄ Ю̆ Ю̈ Ю̄ Я̆ Я̄ Я̈ Ӏ ʼ ˮ
Archaic or unused letters
А̨ Б̀ Б̣ Б̱ В̀ Г̀ Г̧ Г̄ Г̓ Г̆ Ҕ̀ Ҕ̆ Ԁ Д̓ Д̀ Д̨ Ԃ Ꚁ Ꙣ Е̇ Е̨ Ж̀ Ж̑ Ꙃ Ꙅ Џ̆ Ꚅ Ꚅ̆ Ꙁ З̀ З̑ Ԅ Ԇ Ꚉ Ԫ Ꚃ Ꚕ І̂ І̣ І̨ Ј̵ Ј̃ Ꙉ К̓ К̀ К̆ Ӄ̆ К̑ К̇ К̈ К̄ Ԟ К̂ Л̀ Ԡ Ꙥ Ԉ Л̑ Л̇ Ԕ М̀ М̃ Ꙧ Н̀ Н̄ Н̧ Н̃ Ԋ Ԣ Н̡ Ѻ Ꙩ Ꙫ Ꙭ ꙮ Ꚙ Ꚛ П̓ П̀ П́ Ҧ П̧ П̑ Ҁ Ԛ̆ Р́ Р̀ Р̃ Ԗ С̀ С̈ Ԍ Ҫ̓ Т̓ Т̀ Ԏ Т̑ Ꚋ Т̧ Ꚍ Ꚍ̆ ОУ Ꙋ У̇ У̨ ꙋ́ Ф̑ Ф̓ Х́ Х̀ Х̆ Х̇ Х̧ Х̾ Х̓ һ̱ Ѡ Ꙍ Ѽ Ѿ Ꙡ Ц̀ Ц́ Ц̓ Ꚏ Ꚏ̆ Ꚑ Ч́ Ч̀ Ч̆ Ч̑ Ч̓ Ԭ Ꚓ Ꚇ Ꚇ̆ Ҽ̆ Ш̀ Ш̆ Ш̑ Щ̆ Ꚗ Ꚗ̆ Ъ̄ Ъ̈ Ъ̈̄ Ꙑ Ы̂ Ы̃ Ѣ́ Ѣ̈ Ѣ̆ Ꙓ Э̨ Э̂ Ꙕ Ю̂ Ꙗ Я̈ Я̂ Я̨ Ԙ Ѥ Ѧ Ꙙ Ѫ Ꙛ Ѩ Ꙝ Ѭ Ѯ Ѱ Ѳ Ѵ Ѷ Ꙟ
List of Cyrillic letters List of Cyrillic multigraphs
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The letter is usually romanised into English and most other West European languages as ⟨y⟩: Krylov (family name, Крылов). That spelling matches Polish, which uses ⟨y⟩ to represent a very similar sound. Russian ⟨ы⟩ is used to transliterate Polish ⟨y⟩ into Cyrillic: Maryla (Марыля). However, Latin ⟨y⟩ may be used for other purposes as well (such as for ⟨й⟩, or as part of digraphs, e.g. ⟨я⟩).

In most Turkic languages that use Cyrillic, ⟨ы⟩ represents the close back unrounded vowel /ɯ/, like in Kazakh, Kyrgyz, etc.

Like many other Cyrillic letters, it was originally from a ligature ꙑ (which is represented in Unicode as Yeru with Back Yer), formed from Yer ⟨ъ⟩ and Dotted I ⟨і⟩ (formerly written either dotless or with two dots) or Izhe (⟨и⟩ which formerly resembled ⟨н⟩). In Medieval manuscripts, it is almost always found as ⟨ъі⟩ or ⟨ъи⟩.^{[citation needed]} The modern form ⟨ы⟩ first occurred in South Slavic manuscripts following the loss of palatalization of word-final and preconsonantal consonants, so the letters ⟨ъ⟩ and ⟨ь⟩ became confused; since the end of the 14th century, ⟨ы⟩ came to be used in East Slavic manuscripts.^{[citation needed]}

While vowel letters in the Cyrillic alphabet may be divided into iotated and non-iotated pairs (for example, ⟨а⟩ and ⟨я⟩ both represent /a/, the latter denoting a preceding palatalised consonant), ⟨ы⟩ is more complicated. It appears only after hard consonants, its phonetic value differs from ⟨и⟩, and there is some scholarly disagreement as to whether or not ⟨ы⟩ and ⟨и⟩ denote different phonemes.^{[citation needed]}

• И и : Cyrillic letter I
• Й й : Cyrillic letter Short I
• Ъ ъ : Cyrillic letter Yer
• Ь ь : Cyrillic letter Soft sign
• Ҍ ҍ : Cyrillic letter semisoft sign
• Ѣ ѣ : Cyrillic letter yat
• I ı : Latin letter Dotless I
• Ь ь : Latin letter I with bowl
• Ư ư : Latin letter U with horn, the 26th letter of the Vietnamese alphabet.
• Y y : Latin letter Y