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 mirrored. The word that U+2321 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The integral symbol:
is used to denote integrals and antiderivatives in mathematics, especially in calculus.
Representations
System
Representation (click value to copy)
Nº
8993
UTF-8
E2 8C A1
UTF-16
23 21
UTF-32
00 00 23 21
URL-Quoted
%E2%8C%A1
HTML hex reference
⌡
Wrong windows-1252 Mojibake
⌡
Encoding: CP437 (hex bytes)
F5
Encoding: CP860 (hex bytes)
F5
Encoding: CP861 (hex bytes)
F5
Encoding: CP862 (hex bytes)
F5
Encoding: CP863 (hex bytes)
F5
Encoding: CP865 (hex bytes)
F5
Encoding: GB18030 (hex bytes)
81 36 EA 37
Encoding: KOI8_R (hex bytes)
9B
Encoding: KOI8_U (hex bytes)
9B
Adobe Glyph List
integralbottom
Adobe Glyph List
integralbt
digraph
Il
RFC 5137
\u'2321'
Bash and Zsh inside echo -e
\u2321
C and C++
\u2321
C#
\u2321
CSS
\002321
Excel
=UNICHAR(8993)
Go
\u2321
JavaScript
\u2321
Modern JavaScript since ES6
\u{2321}
JSON
\u2321
Java
\u2321
Lua
\u{2321}
Matlab
char(8993)
Perl
"\x{2321}"
PHP
\u{2321}
PostgreSQL
U&'\2321'
PowerShell
`u{2321}
Python
\u2321
Ruby
\u{2321}
Rust
\u{2321}
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