This character is a Other 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+2331 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In mathematics, the origin of a Euclidean space is a special point, usually denoted by the letter O, used as a fixed point of reference for the geometry of the surrounding space.
In physical problems, the choice of origin is often arbitrary, meaning any choice of origin will ultimately give the same answer. This allows one to pick an origin point that makes the mathematics as simple as possible, often by taking advantage of some kind of geometric symmetry.
Representations
System
Representation (click value to copy)
Nº
9009
UTF-8
E2 8C B1
UTF-16
23 31
UTF-32
00 00 23 31
URL-Quoted
%E2%8C%B1
HTML hex reference
⌱
Wrong windows-1252 Mojibake
⌱
Encoding: GB18030 (hex bytes)
81 36 EC 33
RFC 5137
\u'2331'
Bash and Zsh inside echo -e
\u2331
C and C++
\u2331
C#
\u2331
CSS
\002331
Excel
=UNICHAR(9009)
Go
\u2331
JavaScript
\u2331
Modern JavaScript since ES6
\u{2331}
JSON
\u2331
Java
\u2331
Lua
\u{2331}
Matlab
char(9009)
Perl
"\x{2331}"
PHP
\u{2331}
PostgreSQL
U&'\2331'
PowerShell
`u{2331}
Python
\u2331
Ruby
\u{2331}
Rust
\u{2331}
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