Both the horizontal and the vertical digraph were borrowed from the Greek alphabet. The Greek ligature Ou is frequently encountered in Greek medieval manuscripts and in some modern editions of classical texts. Modern Greek still uses for but rarely uses the vertical ligature.
The simplification of the digraph to 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, and after a consonant. Before a consonant, was used 89% of the time in the writings before 1100. By 1200, it was used 61% of the time, with the letter used 14% of the time; by 1300, оу had reached 28%, surpassed by at 45%. From the late 14th century on, there are no more instances of being used in this position, with appearing 95% of the time. The decrease in usage was more gradual after a consonant. Although there are no instances of the use of in this position before c. 1200, gradually decreased from 88% before 1100 to 57% by 1200. The frequency of remained steady between 47% and 44% until 1400, when it experienced another decrease to 32%. Meanwhile, the use of 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.
Representation on computers
The letter Uk was first represented in Unicode 1.1.0 as and 0479, CYRILLIC CAPITAL/SMALL LETTER UK. 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, uppercase, or in all caps, 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, and recommends composing the digraph with two individual characters +. Unicode 9.0 has also introduced U+1C82 CYRILLIC SMALL LETTER NARROW O which can also be used for composing the digraph form and U+1C88 CYRILLIC SMALL LETTER UNBLENDED UK 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 Slavoniccomputer 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 is incorrect. The minuscule monograph Uk was used in the Romanian Transitional Alphabet to represent, but due to font restrictions, the Ȣ ligature or Latin gamma are occasionally used instead.
