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+0259 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:
Ə, or ə, also called schwa, is an additional letter of the Latin alphabet. In the International Phonetic Alphabet (IPA), minuscule ə is used to represent the mid central vowel or a schwa.
It was invented by Johann Andreas Schmeller for the reduced vowel at the end of some German words and first used in his 1820s works on the Bavarian dialects.
Representations
System
Representation (click value to copy)
Nº
601
UTF-8
C9 99
UTF-16
02 59
UTF-32
00 00 02 59
URL-Quoted
%C9%99
HTML hex reference
ə
Wrong windows-1252 Mojibake
É™
Encoding: EUC_JIS_2004 (hex bytes)
AB B0
Encoding: EUC_JISX0213 (hex bytes)
AB B0
Encoding: GB18030 (hex bytes)
81 30 AC 35
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 2B 30 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 2B 30 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
86 4F
Encoding: SHIFT_JISX0213 (hex bytes)
86 4F
LATEX
\Elzschwa
AGL: Latin-4
uni0259
AGL: Latin-5
uni0259
Adobe Glyph List
schwa
RFC 5137
\u'0259'
Bash and Zsh inside echo -e
\u0259
C and C++
\u0259
C#
\u0259
CSS
\000259
Excel
=UNICHAR(601)
Go
\u0259
JavaScript
\u0259
Modern JavaScript since ES6
\u{259}
JSON
\u0259
Java
\u0259
Lua
\u{259}
Matlab
char(601)
Perl
"\x{259}"
PHP
\u{259}
PostgreSQL
U&'\0259'
PowerShell
`u{259}
Python
\u0259
Ruby
\u{259}
Rust
\u{259}
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