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+23E7 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Miscellaneous Technical is a Unicode block ranging from U+2300 to U+23FF. It contains various common symbols which are related to and used in the various technical, programming language, and academic professions. For example:
Symbol ⌂ (HTML hexadecimal code is ⌂) represents a house or a home.
Symbol ⌘ (⌘) is a "place of interest" sign. It may be used to represent the Command key on a Mac keyboard.
Symbol ⌚ (⌚) is a watch (or clock).
Symbol ⏏ (⏏) is the "Eject" button symbol found on electronic equipment.
Symbol ⏚ (⏚) is the "Earth Ground" symbol found on electrical or electronic manual, tag and equipment.
It also includes most of the uncommon symbols used by the APL programming language.
Representations
System
Representation (click value to copy)
Nº
9191
UTF-8
E2 8F A7
UTF-16
23 E7
UTF-32
00 00 23 E7
URL-Quoted
%E2%8F%A7
HTML hex reference
⏧
Wrong windows-1252 Mojibake
â§
HTML named entity
⏧
Encoding: GB18030 (hex bytes)
81 36 FE 35
RFC 5137
\u'23E7'
Bash and Zsh inside echo -e
\u23E7
C and C++
\u23E7
C#
\u23E7
CSS
\0023E7
Excel
=UNICHAR(9191)
Go
\u23E7
JavaScript
\u23E7
Modern JavaScript since ES6
\u{23e7}
JSON
\u23E7
Java
\u23E7
Lua
\u{23E7}
Matlab
char(9191)
Perl
"\x{23E7}"
PHP
\u{23e7}
PostgreSQL
U&'\23E7'
PowerShell
`u{23E7}
Python
\u23E7
Ruby
\u{23e7}
Rust
\u{23e7}
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