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+2828 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Braille pattern dots-46 ( ⠨ ) is a 6-dot braille cell with the top and bottom right dots raised, or an 8-dot braille cell with the top and lower-middle right dots raised. It is represented by the Unicode code point U+2828, and in Braille ASCII with a period: "." .
Representations
System
Representation (click value to copy)
Nº
10280
UTF-8
E2 A0 A8
UTF-16
28 28
UTF-32
00 00 28 28
URL-Quoted
%E2%A0%A8
HTML hex reference
⠨
Wrong windows-1252 Mojibake
â ¨
Encoding: GB18030 (hex bytes)
81 37 D9 34
RFC 5137
\u'2828'
Bash and Zsh inside echo -e
\u2828
C and C++
\u2828
C#
\u2828
CSS
\002828
Excel
=UNICHAR(10280)
Go
\u2828
JavaScript
\u2828
Modern JavaScript since ES6
\u{2828}
JSON
\u2828
Java
\u2828
Lua
\u{2828}
Matlab
char(10280)
Perl
"\x{2828}"
PHP
\u{2828}
PostgreSQL
U&'\2828'
PowerShell
`u{2828}
Python
\u2828
Ruby
\u{2828}
Rust
\u{2828}
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