Computer Encoding
In Unicode, it is encoded for use in Latin as "Latin Capital Script OU" (U+0222 Ȣ) and "Latin Small Letter OU" (U+0223, ȣ) in the Latin Extended-B range, and for use in Cyrillic as Cyrillic letter monograph Uk (uppercase U+A64A, Ꙋ, lowercase U+A64B, ꙋ), in addition to now deprecated "Cyrillic letter Uk" (uppercase U+0478, Ѹ, lowercase U+0479, ѹ), which may be realized with the "о" and "у" either side by side or combined vertically.
Despite the ligature's origin in Greek, there is no separate provision for its encoding in the Greek script, because it was deemed to be a mere ligature on the font level but not a separate underlying character. A proposal for encoding it as "Greek letter ou" was made in 1998, but was rejected.
In older character encodings (such as ISO 8859) and locales where Unicode is not available, it is usually represented by the 8 glyph.
Read more about this topic: Ou (ligature)
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