This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as lazy S.
The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Other Neutral. When changing direction it is mirrored into Tilde Operator. If its East Asian Width is “narrow”, U+223D forms a word with similar characters, which prevents a line break inside it. Otherwise it allows line breaks around it, except in some numeric contexts.
The CLDR project calls this character “reversed tilde” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: reversed, tilde.
The Wikipedia has the following information about this codepoint:
An approximation is anything that is intentionally similar but not exactly equal to something else.
Representations
System
Representation (click value to copy)
Nº
8765
UTF-8
E2 88 BD
UTF-16
22 3D
UTF-32
00 00 22 3D
URL-Quoted
%E2%88%BD
HTML hex reference
∽
Wrong windows-1252 Mojibake
∽
HTML named entity
∽
HTML named entity
∽
alias
lazy S
Encoding: CP932 (hex bytes)
81 E4
Encoding: CP949 (hex bytes)
A1 EF
Encoding: EUC_JP (hex bytes)
A2 E6
Encoding: EUC_JIS_2004 (hex bytes)
A2 E6
Encoding: EUC_JISX0213 (hex bytes)
A2 E6
Encoding: EUC_KR (hex bytes)
A1 EF
Encoding: GB2312 (hex bytes)
A1 D7
Encoding: GBK (hex bytes)
A1 D7
Encoding: GB18030 (hex bytes)
A1 D7
Encoding: HZ (hex bytes)
7E 7B 21 57 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 22 66 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 21 6F 0F
Encoding: JOHAB (hex bytes)
D9 91
Encoding: SHIFT_JIS (hex bytes)
81 E4
Encoding: SHIFT_JIS_2004 (hex bytes)
81 E4
Encoding: SHIFT_JISX0213 (hex bytes)
81 E4
LATEX
\backsim
Adobe Glyph List
reversedtilde
RFC 5137
\u'223D'
Bash and Zsh inside echo -e
\u223D
C and C++
\u223D
C#
\u223D
CSS
\00223D
Excel
=UNICHAR(8765)
Go
\u223D
JavaScript
\u223D
Modern JavaScript since ES6
\u{223d}
JSON
\u223D
Java
\u223D
Lua
\u{223D}
Matlab
char(8765)
Perl
"\x{223D}"
PHP
\u{223d}
PostgreSQL
U&'\223D'
PowerShell
`u{223D}
Python
\u223D
Ruby
\u{223d}
Rust
\u{223d}
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