The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+043E 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:
O (О о; italics: О о) is a letter of the Cyrillic script.
The letter most commonly represents the sound /ɔ/, like the o in "off". In Russian and Serbo-Croatian, it represents the sound /o/.
Representations
System
Representation (click value to copy)
Nº
1086
UTF-8
D0 BE
UTF-16
04 3E
UTF-32
00 00 04 3E
URL-Quoted
%D0%BE
HTML hex reference
о
Wrong windows-1252 Mojibake
о
HTML named entity
о
Encoding: BIG5 (hex bytes)
C7 D7
Encoding: BIG5HKSCS (hex bytes)
C8 64
Encoding: CP855 (hex bytes)
D6
Encoding: CP866 (hex bytes)
AE
Encoding: CP932 (hex bytes)
84 80
Encoding: CP949 (hex bytes)
AC E0
Encoding: CP950 (hex bytes)
C7 D7
Encoding: CP1125 (hex bytes)
AE
Encoding: CP1251 (hex bytes)
EE
Encoding: EUC_JP (hex bytes)
A7 E0
Encoding: EUC_JIS_2004 (hex bytes)
A7 E0
Encoding: EUC_JISX0213 (hex bytes)
A7 E0
Encoding: EUC_KR (hex bytes)
AC E0
Encoding: GB2312 (hex bytes)
A7 E0
Encoding: GBK (hex bytes)
A7 E0
Encoding: GB18030 (hex bytes)
A7 E0
Encoding: HZ (hex bytes)
7E 7B 27 60 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 27 60 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2C 60 0F
Encoding: ISO8859_5 (hex bytes)
DE
Encoding: JOHAB (hex bytes)
DE E0
Encoding: KOI8_R (hex bytes)
CF
Encoding: KOI8_T (hex bytes)
CF
Encoding: KOI8_U (hex bytes)
CF
Encoding: KZ1048 (hex bytes)
EE
Encoding: MAC_CYRILLIC (hex bytes)
EE
Encoding: PTCP154 (hex bytes)
EE
Encoding: SHIFT_JIS (hex bytes)
84 80
Encoding: SHIFT_JIS_2004 (hex bytes)
84 80
Encoding: SHIFT_JISX0213 (hex bytes)
84 80
Encoding: CP1025 (hex bytes)
9E
Encoding: CP1123 (hex bytes)
9E
LATEX
\cyrchar\cyro
Adobe Glyph List
afii10080
Adobe Glyph List
ocyrillic
digraph
o=
RFC 5137
\u'043E'
Bash and Zsh inside echo -e
\u043E
C and C++
\u043E
C#
\u043E
CSS
\00043E
Excel
=UNICHAR(1086)
Go
\u043E
JavaScript
\u043E
Modern JavaScript since ES6
\u{43e}
JSON
\u043E
Java
\u043E
Lua
\u{43E}
Matlab
char(1086)
Perl
"\x{43E}"
PHP
\u{43e}
PostgreSQL
U&'\043E'
PowerShell
`u{43E}
Python
\u043E
Ruby
\u{43e}
Rust
\u{43e}
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