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+AA10 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
43536
UTF-8
EA A8 90
UTF-16
AA 10
UTF-32
00 00 AA 10
URL-Quoted
%EA%A8%90
HTML hex reference
ꨐ
Wrong windows-1252 Mojibake
ê¨
Encoding: GB18030 (hex bytes)
82 37 9D 39
RFC 5137
\u'AA10'
Bash and Zsh inside echo -e
\uAA10
C and C++
\uAA10
C#
\uAA10
CSS
\00AA10
Excel
=UNICHAR(43536)
Go
\uAA10
JavaScript
\uAA10
Modern JavaScript since ES6
\u{aa10}
JSON
\uAA10
Java
\uAA10
Lua
\u{AA10}
Matlab
char(43536)
Perl
"\x{AA10}"
PHP
\u{aa10}
PostgreSQL
U&'\AA10'
PowerShell
`u{AA10}
Python
\uAA10
Ruby
\u{aa10}
Rust
\u{aa10}
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