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+2808 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Braille pattern dots-4 ( ⠈ ) is a 6-dot or 8-dot braille cell with the top right dot raised. It is represented by the Unicode code point U+2808, and in Braille ASCII with the "at" sign: @.
Representations
System
Representation (click value to copy)
Nº
10248
UTF-8
E2 A0 88
UTF-16
28 08
UTF-32
00 00 28 08
URL-Quoted
%E2%A0%88
HTML hex reference
⠈
Wrong windows-1252 Mojibake
â ˆ
Encoding: GB18030 (hex bytes)
81 37 D6 32
RFC 5137
\u'2808'
Bash and Zsh inside echo -e
\u2808
C and C++
\u2808
C#
\u2808
CSS
\002808
Excel
=UNICHAR(10248)
Go
\u2808
JavaScript
\u2808
Modern JavaScript since ES6
\u{2808}
JSON
\u2808
Java
\u2808
Lua
\u{2808}
Matlab
char(10248)
Perl
"\x{2808}"
PHP
\u{2808}
PostgreSQL
U&'\2808'
PowerShell
`u{2808}
Python
\u2808
Ruby
\u{2808}
Rust
\u{2808}
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