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+042A 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:
The letter Ъ ъ (italics Ъ, ъ) of the Cyrillic script is known as er golyam (ер голям – "big er") in the Bulgarian alphabet, as the hard sign (Russian: твёрдый знак, romanized: tvjordyj znak, pronounced[ˈtvʲɵrdɨjˈznak], Rusyn: твердый знак, romanized: tverdyj znak) in the modern Russian and Rusyn alphabets (although in Rusyn, ъ could also be known as ір), as the debelo jer (дебело їер, "fat er") in pre-reform Serbian orthography, and as ayirish belgisi in the Uzbek Cyrillic alphabet. The letter is called back yer or back jer and yor or jor in the pre-reform Russian orthography, in Old East Slavic, and in Old Church Slavonic.
Originally the yer denoted an ultra-short or reduced mid rounded vowel. It is one of two reduced vowels that are collectively known as the yers in Slavic philology.
Representations
System
Representation (click value to copy)
Nº
1066
UTF-8
D0 AA
UTF-16
04 2A
UTF-32
00 00 04 2A
URL-Quoted
%D0%AA
HTML hex reference
Ъ
Wrong windows-1252 Mojibake
Ъ
HTML named entity
Ъ
Encoding: BIG5 (hex bytes)
C7 C2
Encoding: BIG5HKSCS (hex bytes)
C8 4F
Encoding: CP855 (hex bytes)
9F
Encoding: CP866 (hex bytes)
9A
Encoding: CP932 (hex bytes)
84 5B
Encoding: CP949 (hex bytes)
AC BC
Encoding: CP950 (hex bytes)
C7 C2
Encoding: CP1125 (hex bytes)
9A
Encoding: CP1251 (hex bytes)
DA
Encoding: EUC_JP (hex bytes)
A7 BC
Encoding: EUC_JIS_2004 (hex bytes)
A7 BC
Encoding: EUC_JISX0213 (hex bytes)
A7 BC
Encoding: EUC_KR (hex bytes)
AC BC
Encoding: GB2312 (hex bytes)
A7 BC
Encoding: GBK (hex bytes)
A7 BC
Encoding: GB18030 (hex bytes)
A7 BC
Encoding: HZ (hex bytes)
7E 7B 27 3C 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 27 3C 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2C 3C 0F
Encoding: ISO8859_5 (hex bytes)
CA
Encoding: JOHAB (hex bytes)
DE BC
Encoding: KOI8_R (hex bytes)
FF
Encoding: KOI8_T (hex bytes)
FF
Encoding: KOI8_U (hex bytes)
FF
Encoding: KZ1048 (hex bytes)
DA
Encoding: MAC_CYRILLIC (hex bytes)
9A
Encoding: PTCP154 (hex bytes)
DA
Encoding: SHIFT_JIS (hex bytes)
84 5B
Encoding: SHIFT_JIS_2004 (hex bytes)
84 5B
Encoding: SHIFT_JISX0213 (hex bytes)
84 5B
Encoding: CP1025 (hex bytes)
57
Encoding: CP1123 (hex bytes)
57
LATEX
\cyrchar\CYRHRDSN
Adobe Glyph List
Hardsigncyrillic
Adobe Glyph List
afii10044
digraph
="
RFC 5137
\u'042A'
Bash and Zsh inside echo -e
\u042A
C and C++
\u042A
C#
\u042A
CSS
\00042A
Excel
=UNICHAR(1066)
Go
\u042A
JavaScript
\u042A
Modern JavaScript since ES6
\u{42a}
JSON
\u042A
Java
\u042A
Lua
\u{42A}
Matlab
char(1066)
Perl
"\x{42A}"
PHP
\u{42a}
PostgreSQL
U&'\042A'
PowerShell
`u{42A}
Python
\u042A
Ruby
\u{42a}
Rust
\u{42a}
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