# Uk (Cyrillic)

The Cyrillic script :
Slavic letters :
| А | А̂ | А̄ | Ӑ | Ӓ | Б | В | Г |
| Ґ | Д | Ђ | Ѓ | Е | Е̂ | Е̄ | Ё |
| Є | Є́ | Ж | З | З́ | Ѕ | И | І |
| І́ | Ї | Ꙇ | И̂ | Ӣ | Й | Ӥ | Ј |
| К | Л | Љ | М | Н | Њ | О | О̂ |
| О̄ | Ӧ | П | Р | С | С́ | Т | Ћ |
| Ќ | У | У̂ | Ӯ | Ў | Ӱ | Ф | Х |
| Ц | Ч | Џ | Ш | Щ | Ꙏ | Ъ | Ы |
| Ь | Ѣ | Э | Ю | Я | ʼ | ˮ | |
Non-Slavic letters :
| А̊ | А̃ | Ӓ̄ | Ӕ | Ә | Ә̃ | Ӛ | В̌ |
| Ԝ | Г̑ | Г̇ | Г̣ | Г̌ | Г̂ | Г̆ | Г̈ |
| Г̊ | Ҕ | Ғ | | Ӻ | Ғ̌ | Ғ̊ | Ӷ |
| Г̡ | Д́ | Д̌ | Д̈ | Д̣ | Д̆ | Ӗ | Е̃ |
| Ё̄ | Є̈ | Ԑ | Ԑ̈ | Җ | Ӝ | Ӂ | Ж̣ |
| Ҙ | Ӟ | З̌ | З̣ | З̆ | Ӡ | И̃ | И̇ |
| Ҋ | Қ | Ӄ | Ҡ | Ҟ | Ҝ | К̣ | К̊ |
| Қ̊ | 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 | Р̌ | Ҏ | С̌ | Ҫ | С̣ | С̱ |
| Т́ | Т̈ | Т̌ | Т̇ | Т̣ | Ҭ | Ᲊ | У̃ |
| У̌ | Ӳ | У̊ | Ӱ̄ | Ұ | Ү | Ү́ | Х̣ |
| Х̱ | Х̮ | Х̑ | Х̌ | Ҳ | Ӽ | Х̊ | Ӿ |
| Ӿ̊ | Һ | Һ̈ | Ԧ | Ц̌ | Ц̈ | Ҵ | Ҷ |
| Ҷ̣ | Ӵ | Ӌ | | Ҹ | Ч̇ | Ч̣ | Ҽ |
| Ҿ | Ш̣ | ꚜ | Ы̆ | Ы̄ | Ӹ | ꚝ | Ҍ |
| Ҩ | Э̆ | Э̄ | Э̇ | Ӭ | Ӭ́ | Ӭ̄ | Ю̆ |
| Ю̈ | Ю̄ | Я̆ | Я̄ | Я̈ | Ӏ | | |
Archaic or unused letters :
А̨Б̀Б̣Б̱В̀Г̀Г̧Г̄Г̓Г̆Ҕ̀Ҕ̆ԀД̓Д̀Д̨ԂꚀꙢЕ̇Е̨Ж̀Ж̑ꙂꙄЏ̆ꚄꚄ̆ꙀЗ̀З̑ԄԆꚈԪꚂꚔІ̂І̣І̨Ј̵Ј̃ꙈК̓К̀К̆Ӄ̆К̑К̇К̈К̄ԞК̂Л̀ԠꙤԈЛ̑Л̇ԔМ̀М̃ꙦН̀Н̄Н̧Н̃ԊԢН̡ѺꙨꙪꙬꙮꚘꚚП̓П̀П́ҦП̧П̑ҀԚ̆Р́Р̀Р̃ԖС̀С̈ԌҪ̓Т̓Т̀ԎТ̑ꚊТ̧ꚌꚌ̆ѸꙊУ̇У̨ꙋ́Ф̑Ф̓Х́Х̀Х̆Х̇Х̧Х̾Х̓һ̱ѠꙌѼѾꙠЦ̀Ц́Ц̓ꚎꚎ̆ꚐЧ́Ч̀Ч̆Ч̑Ч̓ԬꚒꚆꚆ̆Ҽ̆Ш̀Ш̆Ш̑Щ̆ꚖꚖ̆Ъ̄Ъ̈Ъ̈̄ꙐЫ̂Ы̃Ѣ́Ѣ̈Ѣ̆ꙒЭ̨Э̂ꙔЮ̂ꙖЯ̈Я̂Я̨ԘѤѦꙘѪꙚѨꙜѬѮѰѲѴѶꙞ :
List of Cyrillic letters
List of Cyrillic multigraphs :
vte :
Uk (Ѹ ѹ; italics: Ѹ ѹ) is a digraph of the early Cyrillic alphabet of the letters О and У, although commonly considered and used as a single letter. To save space, it was often written as a vertical ligature (Ꙋ ꙋ), called "monograph Uk". In modern times, ⟨оу⟩ has been replaced by the simple ⟨у⟩. Ѹ is romanized as U, Ꙋ is romanized as Ū.

## Development in Old East Slavic

The simplification of the digraph ⟨оу⟩ to ⟨у⟩ was first brought about in Old East Slavic texts and only later taken over into South Slavic languages.
One can see this development in the Novgorod birch-bark letters: The degree to which this letter was used here differed in two positions: in word-initial position or before a vowel (except for the jers), and after a consonant.
Before a consonant, ⟨оу⟩ was used 89% of the time in the writings before 1100. By 1200, it was used 61% of the time, with the letter ⟨у⟩ used 14% of the time; by 1300, оу had reached 28%, surpassed by ⟨у⟩ at 45%. From the late 14th century on, there are no more instances of ⟨оу⟩ being used in this position, with ⟨у⟩ appearing 95% of the time.
The decrease in usage was more gradual after a consonant. Although there are no instances of the use of ⟨у⟩ in this position before c. 1200, ⟨оу⟩ gradually decreased from 88% before 1100 to 57% by 1200. The frequency of ⟨оу⟩ remained steady between 47% and 44% until 1400, when it experienced another decrease to 32%. Meanwhile, the use of ⟨у⟩ increased from 4% in the early 13th century, to 20% by the mid-13th century, 38% by the mid 14th century, and 58% by the early 15th century.

## Church Slavonic

Similarly to the letter І, the usage of Uk in Church Slavonic orthography was standardised by Meletius Smotrytsky, who assigned the two different forms (monograph and digraph) different functions. The original оу form was to be used at the beginning of words (for example, оучитель) while the monograph ꙋ was to be used in the middle and end of words (for example, мꙋжъ, комꙋ). Similarly to the rule for і, this would be used in most Cyrillic languages until the adoption of the Civil script.

## Representation on computers

The letter Uk was first represented in Unicode 1.1.0 as U+0478 and 0479, CYRILLIC CAPITAL/SMALL LETTER UK (Ѹ ѹ). It was later recognized that the glyph to be used for the letter had not been adequately specified, and it had been represented as either a digraph or monograph letter in different released fonts. There was also the difficulty that in written texts the letter may appear in lowercase (оу), uppercase (Оу), or in all caps (ОУ), which is possible to be used for heading.
To resolve this ambiguity, Unicode 5.1 has deprecated the use of the original code points, introduced U+A64A and A64B, CYRILLIC CAPITAL/SMALL LETTER MONOGRAPH UK (Ꙋ ꙋ), and recommends composing the digraph with two individual characters ⟨о⟩+⟨у⟩.
Unicode 9.0 has also introduced U+1C82 CYRILLIC SMALL LETTER NARROW O which can also be used for composing the digraph form (⟨ᲂ⟩+⟨у⟩) and U+1C88 CYRILLIC SMALL LETTER UNBLENDED UK (ᲈ) as a variant of monograph form.
However, the recommended method may cause some text representation problems. The letter У did not originally appear alone in the Old Church Slavonic orthography, and thus its code point was replaced in different Old Slavonic computer fonts with digraph or monograph forms of the Uk or with the tailed form of Izhitsa. Tailed Izhitsa may be used as a part of the digraph, but using the shape of the monograph Uk as a part of the digraph Uk (оꙋ) is incorrect.
The minuscule monograph Uk was used in the Romanian Transitional Alphabet to represent /u/, but due to font restrictions, the Ȣ ligature or Latin gamma are occasionally used instead.

## Computing codes

Character information :
| Preview | О | О | о | о | ᲂ | ᲂ | У | У | у | у |
| Unicode name | CYRILLIC CAPITAL LETTER O | CYRILLIC CAPITAL LETTER O | CYRILLIC SMALL LETTER O | CYRILLIC SMALL LETTER O | CYRILLIC SMALL LETTER NARROW O | CYRILLIC SMALL LETTER NARROW O | CYRILLIC CAPITAL LETTER U | CYRILLIC CAPITAL LETTER U | CYRILLIC SMALL LETTER U | CYRILLIC SMALL LETTER U |
| Encodings | decimal | hex | dec | hex | dec | hex | dec | hex | dec | hex |
| Unicode | 1054 | U+041E | 1086 | U+043E | 7298 | U+1C82 | 1059 | U+0423 | 1091 | U+0443 |
| UTF-8 | 208 158 | D0 9E | 208 190 | D0 BE | 225 178 130 | E1 B2 82 | 208 163 | D0 A3 | 209 131 | D1 83 |
| Numeric character reference | &#1054; | &#x41E; | &#1086; | &#x43E; | &#7298; | &#x1C82; | &#1059; | &#x423; | &#1091; | &#x443; |
| Named character reference | &Ocy; | &Ocy; | &ocy; | &ocy; | | | &Ucy; | &Ucy; | &ucy; | &ucy; |
Character information :
| Preview | Ѹ | Ѹ | ѹ | ѹ | Ꙋ | Ꙋ | ꙋ | ꙋ | ᲈ | ᲈ |
| Unicode name | CYRILLIC CAPITAL LETTER UK | CYRILLIC CAPITAL LETTER UK | CYRILLIC SMALL LETTER UK | CYRILLIC SMALL LETTER UK | CYRILLIC CAPITAL LETTER MONOGRAPH UK | CYRILLIC CAPITAL LETTER MONOGRAPH UK | CYRILLIC SMALL LETTER MONOGRAPH UK | CYRILLIC SMALL LETTER MONOGRAPH UK | CYRILLIC SMALL LETTER UNBLENDED UK | CYRILLIC SMALL LETTER UNBLENDED UK |
| Encodings | decimal | hex | dec | hex | dec | hex | dec | hex | dec | hex |
| Unicode | 1144 | U+0478 | 1145 | U+0479 | 42570 | U+A64A | 42571 | U+A64B | 7304 | U+1C88 |
| UTF-8 | 209 184 | D1 B8 | 209 185 | D1 B9 | 234 153 138 | EA 99 8A | 234 153 139 | EA 99 8B | 225 178 136 | E1 B2 88 |
| Numeric character reference | &#1144; | &#x478; | &#1145; | &#x479; | &#42570; | &#xA64A; | &#42571; | &#xA64B; | &#7304; | &#x1C88; |