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+0410 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:
А (А а; italics: А а) is a letter of the Cyrillic script. It commonly represents an open central unrounded vowel /ä/, halfway between the pronunciation of ⟨a⟩ in "cat" and "father". The Cyrillic letter А is romanized using the Latin letter A.
Representations
System
Representation (click value to copy)
Nº
1040
UTF-8
D0 90
UTF-16
04 10
UTF-32
00 00 04 10
URL-Quoted
%D0%90
HTML hex reference
А
Wrong windows-1252 Mojibake
Ð
HTML named entity
А
Encoding: BIG5HKSCS (hex bytes)
C7 F3
Encoding: CP855 (hex bytes)
A1
Encoding: CP866 (hex bytes)
80
Encoding: CP932 (hex bytes)
84 40
Encoding: CP949 (hex bytes)
AC A1
Encoding: CP1125 (hex bytes)
80
Encoding: CP1251 (hex bytes)
C0
Encoding: EUC_JP (hex bytes)
A7 A1
Encoding: EUC_JIS_2004 (hex bytes)
A7 A1
Encoding: EUC_JISX0213 (hex bytes)
A7 A1
Encoding: EUC_KR (hex bytes)
AC A1
Encoding: GB2312 (hex bytes)
A7 A1
Encoding: GBK (hex bytes)
A7 A1
Encoding: GB18030 (hex bytes)
A7 A1
Encoding: HZ (hex bytes)
7E 7B 27 21 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 27 21 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2C 21 0F
Encoding: ISO8859_5 (hex bytes)
B0
Encoding: JOHAB (hex bytes)
DE A1
Encoding: KOI8_R (hex bytes)
E1
Encoding: KOI8_T (hex bytes)
E1
Encoding: KOI8_U (hex bytes)
E1
Encoding: KZ1048 (hex bytes)
C0
Encoding: MAC_CYRILLIC (hex bytes)
80
Encoding: PTCP154 (hex bytes)
C0
Encoding: SHIFT_JIS (hex bytes)
84 40
Encoding: SHIFT_JIS_2004 (hex bytes)
84 40
Encoding: SHIFT_JISX0213 (hex bytes)
84 40
Encoding: CP1025 (hex bytes)
B9
Encoding: CP1123 (hex bytes)
B9
LATEX
\cyrchar\CYRA
Adobe Glyph List
Acyrillic
Adobe Glyph List
afii10017
digraph
A=
RFC 5137
\u'0410'
Bash and Zsh inside echo -e
\u0410
C and C++
\u0410
C#
\u0410
CSS
\000410
Excel
=UNICHAR(1040)
Go
\u0410
JavaScript
\u0410
Modern JavaScript since ES6
\u{410}
JSON
\u0410
Java
\u0410
Lua
\u{410}
Matlab
char(1040)
Perl
"\x{410}"
PHP
\u{410}
PostgreSQL
U&'\0410'
PowerShell
`u{410}
Python
\u0410
Ruby
\u{410}
Rust
\u{410}
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