The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+04AF forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Ue or Straight U (Ү ү; italics: Ү ү) is a letter of the Cyrillic script. It is a form of the Cyrillic letter U (У у У у) with a vertical, rather than diagonal, center line. Whereas a standard Cyrillic U resembles a lowercase Latin y, Ue instead uses the shape of a capital Latin Y, with each letter set higher or lower to establish its case. The lower case resembles the lower case of the Greek letter Gamma.
Ue is used the alphabets of the Bashkir, Buryat, Kalmyk, Kazakh, Kyrgyz, Mongolian, Sakha, Turkmen, Tatar and other languages. It commonly represents the front rounded vowels /y/ and /ʏ/, except in Mongolian where it represents /u/.
In Tuvan and Kyrgyz the Cyrillic letter can be written as a double vowel.
Representations
System
Representation (click value to copy)
Nº
1199
UTF-8
D2 AF
UTF-16
04 AF
UTF-32
00 00 04 AF
URL-Quoted
%D2%AF
HTML hex reference
ү
Wrong windows-1252 Mojibake
Ò¯
Encoding: GB18030 (hex bytes)
81 30 DC 33
Encoding: KZ1048 (hex bytes)
BF
Encoding: PTCP154 (hex bytes)
89
LATEX
\cyrchar\cyry
Adobe Glyph List
ustraightcyrillic
RFC 5137
\u'04AF'
Bash and Zsh inside echo -e
\u04AF
C and C++
\u04AF
C#
\u04AF
CSS
\0004AF
Excel
=UNICHAR(1199)
Go
\u04AF
JavaScript
\u04AF
Modern JavaScript since ES6
\u{4af}
JSON
\u04AF
Java
\u04AF
Lua
\u{4AF}
Matlab
char(1199)
Perl
"\x{4AF}"
PHP
\u{4af}
PostgreSQL
U&'\04AF'
PowerShell
`u{4AF}
Python
\u04AF
Ruby
\u{4af}
Rust
\u{4af}
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