This character is a Math Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+22A1 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
The Unicode Standard encodes almost all standard characters used in mathematics.
Unicode Technical Report #25 provides comprehensive information about the character repertoire, their properties, and guidelines for implementation.
Mathematical operators and symbols are in multiple Unicode blocks. Some of these blocks are dedicated to, or primarily contain, mathematical characters while others are a mix of mathematical and non-mathematical characters. This article covers all Unicode characters with a derived property of "Math".
Representations
System
Representation (click value to copy)
Nº
8865
UTF-8
E2 8A A1
UTF-16
22 A1
UTF-32
00 00 22 A1
URL-Quoted
%E2%8A%A1
HTML hex reference
⊡
Wrong windows-1252 Mojibake
⊡
HTML named entity
⊡
HTML named entity
⊡
Encoding: GB18030 (hex bytes)
81 36 DE 32
LATEX
\boxdot
RFC 5137
\u'22A1'
Bash and Zsh inside echo -e
\u22A1
C and C++
\u22A1
C#
\u22A1
CSS
\0022A1
Excel
=UNICHAR(8865)
Go
\u22A1
JavaScript
\u22A1
Modern JavaScript since ES6
\u{22a1}
JSON
\u22A1
Java
\u22A1
Lua
\u{22A1}
Matlab
char(8865)
Perl
"\x{22A1}"
PHP
\u{22a1}
PostgreSQL
U&'\22A1'
PowerShell
`u{22A1}
Python
\u22A1
Ruby
\u{22a1}
Rust
\u{22a1}
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