This character is a Decimal Number and is mainly used in the Kayah Li script. The codepoint has the decimal value 0.
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. This number joins with other adjacent letters and numbers to form a word. U+A900 forms a number with similar characters, which prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Kayah Li alphabet (Kayah Li: ꤊꤢꤛꤢ꤭ ꤜꤟꤤ꤬) is used to write the Kayah languages Eastern Kayah Li and Western Kayah Li, which are members of Karenic branch of the Sino-Tibetan language family. They are also known as Red Karen and Karenni. Eastern Kayah Li is spoken by about 26,000 people, and Western Kayah Li by about 100,000 people, mostly in the Kayah and Karen states of Myanmar, but also by people living in Thailand.
Representations
System
Representation (click value to copy)
Nº
43264
UTF-8
EA A4 80
UTF-16
A9 00
UTF-32
00 00 A9 00
URL-Quoted
%EA%A4%80
HTML hex reference
꤀
Wrong windows-1252 Mojibake
꤀
Encoding: GB18030 (hex bytes)
82 37 82 37
RFC 5137
\u'A900'
Bash and Zsh inside echo -e
\uA900
C and C++
\uA900
C#
\uA900
CSS
\00A900
Excel
=UNICHAR(43264)
Go
\uA900
JavaScript
\uA900
Modern JavaScript since ES6
\u{a900}
JSON
\uA900
Java
\uA900
Lua
\u{A900}
Matlab
char(43264)
Perl
"\x{A900}"
PHP
\u{a900}
PostgreSQL
U&'\A900'
PowerShell
`u{A900}
Python
\uA900
Ruby
\u{a900}
Rust
\u{a900}
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