This character is a Other Letter and is mainly used in the Cham 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. U+AA08 forms an orthographic syllable in Brahmic scripts with similar characters, which prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Cham script (Cham: ꨀꨇꩉ ꨌꩌ)is a Brahmic abugida used to write Cham, an Austronesian language spoken by some 245,000 Chams in Vietnam and Cambodia. It is written horizontally left to right, just like other Brahmic abugidas.
Representations
System
Representation (click value to copy)
Nº
43528
UTF-8
EA A8 88
UTF-16
AA 08
UTF-32
00 00 AA 08
URL-Quoted
%EA%A8%88
HTML hex reference
ꨈ
Wrong windows-1252 Mojibake
ꨈ
Encoding: GB18030 (hex bytes)
82 37 9D 31
RFC 5137
\u'AA08'
Bash and Zsh inside echo -e
\uAA08
C and C++
\uAA08
C#
\uAA08
CSS
\00AA08
Excel
=UNICHAR(43528)
Go
\uAA08
JavaScript
\uAA08
Modern JavaScript since ES6
\u{aa08}
JSON
\uAA08
Java
\uAA08
Lua
\u{AA08}
Matlab
char(43528)
Perl
"\x{AA08}"
PHP
\u{aa08}
PostgreSQL
U&'\AA08'
PowerShell
`u{AA08}
Python
\uAA08
Ruby
\u{aa08}
Rust
\u{aa08}
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