This character is a Math Symbol and is commonly used, that is, in no specific script.
The glyph is a canonical composition of the glyphs Almost Equal To, Combining Long Solidus Overlay. 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+2249 forms with similar adjacent characters prevents a line break inside it.
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
8777
UTF-8
E2 89 89
UTF-16
22 49
UTF-32
00 00 22 49
URL-Quoted
%E2%89%89
HTML hex reference
≉
Wrong windows-1252 Mojibake
≉
HTML named entity
≉
HTML named entity
≉
HTML named entity
≉
Encoding: GB18030 (hex bytes)
81 36 D6 36
LATEX
\not\approx
RFC 5137
\u'2249'
Bash and Zsh inside echo -e
\u2249
C and C++
\u2249
C#
\u2249
CSS
\002249
Excel
=UNICHAR(8777)
Go
\u2249
JavaScript
\u2249
Modern JavaScript since ES6
\u{2249}
JSON
\u2249
Java
\u2249
Lua
\u{2249}
Matlab
char(8777)
Perl
"\x{2249}"
PHP
\u{2249}
PostgreSQL
U&'\2249'
PowerShell
`u{2249}
Python
\u2249
Ruby
\u{2249}
Rust
\u{2249}
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