This character is a Other Letter and is mainly used in the Vai script.
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+A609 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Vai syllabary is a syllabic writing system devised for the Vai language by Momolu Duwalu Bukele of Jondu, in what is now Grand Cape Mount County, Liberia. Bukele is regarded within the Vai community, as well as by most scholars, as the syllabary's inventor and chief promoter when it was first documented in the 1830s. It is one of the two most successful indigenous scripts in West Africa in terms of the number of current users and the availability of literature written in the script, the other being N'Ko.
Representations
System
Representation (click value to copy)
Nº
42505
UTF-8
EA 98 89
UTF-16
A6 09
UTF-32
00 00 A6 09
URL-Quoted
%EA%98%89
HTML hex reference
ꘉ
Wrong windows-1252 Mojibake
ꘉ
Encoding: GB18030 (hex bytes)
82 36 B4 38
RFC 5137
\u'A609'
Bash and Zsh inside echo -e
\uA609
C and C++
\uA609
C#
\uA609
CSS
\00A609
Excel
=UNICHAR(42505)
Go
\uA609
JavaScript
\uA609
Modern JavaScript since ES6
\u{a609}
JSON
\uA609
Java
\uA609
Lua
\u{A609}
Matlab
char(42505)
Perl
"\x{A609}"
PHP
\u{a609}
PostgreSQL
U&'\A609'
PowerShell
`u{A609}
Python
\uA609
Ruby
\u{a609}
Rust
\u{a609}
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