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+2981 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Z notation is a formal specification language used for describing and modelling computing systems. It is targeted at the clear specification of computer programs and computer-based systems in general.
Representations
System
Representation (click value to copy)
Nº
10625
UTF-8
E2 A6 81
UTF-16
29 81
UTF-32
00 00 29 81
URL-Quoted
%E2%A6%81
HTML hex reference
⦁
Wrong windows-1252 Mojibake
â¦
Encoding: GB18030 (hex bytes)
81 37 FB 39
RFC 5137
\u'2981'
Bash and Zsh inside echo -e
\u2981
C and C++
\u2981
C#
\u2981
CSS
\002981
Excel
=UNICHAR(10625)
Go
\u2981
JavaScript
\u2981
Modern JavaScript since ES6
\u{2981}
JSON
\u2981
Java
\u2981
Lua
\u{2981}
Matlab
char(10625)
Perl
"\x{2981}"
PHP
\u{2981}
PostgreSQL
U&'\2981'
PowerShell
`u{2981}
Python
\u2981
Ruby
\u{2981}
Rust
\u{2981}
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