This character is a Other Letter and is mainly used in the Saurashtra 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+A899 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Saurashtra script is an abugida script that is used by Saurashtrians of Tamil Nadu to write the Saurashtra language. The script is of Brahmic origin, although its exact derivation is not known; it was later reformed and standardized by T. M. Rama Rai. Its usage has declined, and the Tamil and Latin scripts are now used more commonly.
Representations
System
Representation (click value to copy)
Nº
43161
UTF-8
EA A2 99
UTF-16
A8 99
UTF-32
00 00 A8 99
URL-Quoted
%EA%A2%99
HTML hex reference
ꢙ
Wrong windows-1252 Mojibake
ꢙ
Encoding: GB18030 (hex bytes)
82 36 F6 34
RFC 5137
\u'A899'
Bash and Zsh inside echo -e
\uA899
C and C++
\uA899
C#
\uA899
CSS
\00A899
Excel
=UNICHAR(43161)
Go
\uA899
JavaScript
\uA899
Modern JavaScript since ES6
\u{a899}
JSON
\uA899
Java
\uA899
Lua
\u{A899}
Matlab
char(43161)
Perl
"\x{A899}"
PHP
\u{a899}
PostgreSQL
U&'\A899'
PowerShell
`u{A899}
Python
\uA899
Ruby
\u{a899}
Rust
\u{a899}
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