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+2842 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Braille pattern dots-2 ( ⠂ ) is a 6-dot braille cell with the middle-left dot raised, or an 8-dot braille cell with its mid-high left dot raised. It is represented by the Unicode code point U+2802, and in Braille ASCII with the number "1".
Representations
System
Representation (click value to copy)
Nº
10306
UTF-8
E2 A1 82
UTF-16
28 42
UTF-32
00 00 28 42
URL-Quoted
%E2%A1%82
HTML hex reference
⡂
Wrong windows-1252 Mojibake
â¡‚
Encoding: GB18030 (hex bytes)
81 37 DC 30
RFC 5137
\u'2842'
Bash and Zsh inside echo -e
\u2842
C and C++
\u2842
C#
\u2842
CSS
\002842
Excel
=UNICHAR(10306)
Go
\u2842
JavaScript
\u2842
Modern JavaScript since ES6
\u{2842}
JSON
\u2842
Java
\u2842
Lua
\u{2842}
Matlab
char(10306)
Perl
"\x{2842}"
PHP
\u{2842}
PostgreSQL
U&'\2842'
PowerShell
`u{2842}
Python
\u2842
Ruby
\u{2842}
Rust
\u{2842}
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