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+2803 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Braille pattern dots-12 ( ⠃ ) is a 6-dot or 8-dot braille cell with the top two left dots raised. It is represented by the Unicode code point U+2803, and in Braille ASCII with "B".
Representations
System
Representation (click value to copy)
Nº
10243
UTF-8
E2 A0 83
UTF-16
28 03
UTF-32
00 00 28 03
URL-Quoted
%E2%A0%83
HTML hex reference
⠃
Wrong windows-1252 Mojibake
â ƒ
Encoding: GB18030 (hex bytes)
81 37 D5 37
RFC 5137
\u'2803'
Bash and Zsh inside echo -e
\u2803
C and C++
\u2803
C#
\u2803
CSS
\002803
Excel
=UNICHAR(10243)
Go
\u2803
JavaScript
\u2803
Modern JavaScript since ES6
\u{2803}
JSON
\u2803
Java
\u2803
Lua
\u{2803}
Matlab
char(10243)
Perl
"\x{2803}"
PHP
\u{2803}
PostgreSQL
U&'\2803'
PowerShell
`u{2803}
Python
\u2803
Ruby
\u{2803}
Rust
\u{2803}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)