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+0391 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:
Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. In the system of Greek numerals, it has a value of one. Alpha is derived from the Phoenician letter aleph , which is the West Semitic word for "ox". Letters that arose from alpha include the Latin letter A and the Cyrillic letter А.
Representations
System
Representation (click value to copy)
Nº
913
UTF-8
CE 91
UTF-16
03 91
UTF-32
00 00 03 91
URL-Quoted
%CE%91
HTML hex reference
Α
Wrong windows-1252 Mojibake
Α
HTML named entity
Α
Encoding: BIG5 (hex bytes)
A3 44
Encoding: BIG5HKSCS (hex bytes)
A3 44
Encoding: CP737 (hex bytes)
80
Encoding: CP869 (hex bytes)
A4
Encoding: CP875 (hex bytes)
41
Encoding: CP932 (hex bytes)
83 9F
Encoding: CP949 (hex bytes)
A5 C1
Encoding: CP950 (hex bytes)
A3 44
Encoding: CP1253 (hex bytes)
C1
Encoding: EUC_JP (hex bytes)
A6 A1
Encoding: EUC_JIS_2004 (hex bytes)
A6 A1
Encoding: EUC_JISX0213 (hex bytes)
A6 A1
Encoding: EUC_KR (hex bytes)
A5 C1
Encoding: GB2312 (hex bytes)
A6 A1
Encoding: GBK (hex bytes)
A6 A1
Encoding: GB18030 (hex bytes)
A6 A1
Encoding: HZ (hex bytes)
7E 7B 26 21 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 26 21 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 25 41 0F
Encoding: ISO8859_7 (hex bytes)
C1
Encoding: JOHAB (hex bytes)
DB 51
Encoding: MAC_GREEK (hex bytes)
B0
Encoding: SHIFT_JIS (hex bytes)
83 9F
Encoding: SHIFT_JIS_2004 (hex bytes)
83 9F
Encoding: SHIFT_JISX0213 (hex bytes)
83 9F
Encoding: CP875 (hex bytes)
41
LATEX
\Alpha
Adobe Glyph List
Alpha
digraph
A*
RFC 5137
\u'0391'
Bash and Zsh inside echo -e
\u0391
C and C++
\u0391
C#
\u0391
CSS
\000391
Excel
=UNICHAR(913)
Go
\u0391
JavaScript
\u0391
Modern JavaScript since ES6
\u{391}
JSON
\u0391
Java
\u0391
Lua
\u{391}
Matlab
char(913)
Perl
"\x{391}"
PHP
\u{391}
PostgreSQL
U&'\0391'
PowerShell
`u{391}
Python
\u0391
Ruby
\u{391}
Rust
\u{391}
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