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 not mirrored. The word that U+2256 forms with similar adjacent characters prevents a line break inside it.
The CLDR project calls this character “ring in equal” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: equal, equality, in, mathematics, ring.
The Wikipedia has the following information about this codepoint:
The equals sign (British English) or equal sign (American English), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. In an equation, it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the same value.
In Unicode and ASCII, it has the code point U+003D. It was invented in 1557 by Robert Recorde.
Representations
System
Representation (click value to copy)
Nº
8790
UTF-8
E2 89 96
UTF-16
22 56
UTF-32
00 00 22 56
URL-Quoted
%E2%89%96
HTML hex reference
≖
Wrong windows-1252 Mojibake
≖
HTML named entity
≖
HTML named entity
≖
Encoding: GB18030 (hex bytes)
81 36 D7 37
LATEX
\eqcirc
RFC 5137
\u'2256'
Bash and Zsh inside echo -e
\u2256
C and C++
\u2256
C#
\u2256
CSS
\002256
Excel
=UNICHAR(8790)
Go
\u2256
JavaScript
\u2256
Modern JavaScript since ES6
\u{2256}
JSON
\u2256
Java
\u2256
Lua
\u{2256}
Matlab
char(8790)
Perl
"\x{2256}"
PHP
\u{2256}
PostgreSQL
U&'\2256'
PowerShell
`u{2256}
Python
\u2256
Ruby
\u{2256}
Rust
\u{2256}
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