This character is a Other Symbol and is mainly used in the Braille 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+2809 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Braille pattern dots-14 ( ⠉ ) is a 6-dot or 8-dot braille cell with the two top dots raised. It is represented by the Unicode code point U+2809, and in Braille ASCII with "C".
Representations
System
Representation (click value to copy)
Nº
10249
UTF-8
E2 A0 89
UTF-16
28 09
UTF-32
00 00 28 09
URL-Quoted
%E2%A0%89
HTML hex reference
⠉
Wrong windows-1252 Mojibake
â ‰
Encoding: GB18030 (hex bytes)
81 37 D6 33
RFC 5137
\u'2809'
Bash and Zsh inside echo -e
\u2809
C and C++
\u2809
C#
\u2809
CSS
\002809
Excel
=UNICHAR(10249)
Go
\u2809
JavaScript
\u2809
Modern JavaScript since ES6
\u{2809}
JSON
\u2809
Java
\u2809
Lua
\u{2809}
Matlab
char(10249)
Perl
"\x{2809}"
PHP
\u{2809}
PostgreSQL
U&'\2809'
PowerShell
`u{2809}
Python
\u2809
Ruby
\u{2809}
Rust
\u{2809}
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