This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as approximately equal to.
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+2257 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
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
8791
UTF-8
E2 89 97
UTF-16
22 57
UTF-32
00 00 22 57
URL-Quoted
%E2%89%97
HTML hex reference
≗
Wrong windows-1252 Mojibake
≗
HTML named entity
≗
HTML named entity
≗
alias
approximately equal to
Encoding: GB18030 (hex bytes)
81 36 D7 38
LATEX
\circeq
RFC 5137
\u'2257'
Bash and Zsh inside echo -e
\u2257
C and C++
\u2257
C#
\u2257
CSS
\002257
Excel
=UNICHAR(8791)
Go
\u2257
JavaScript
\u2257
Modern JavaScript since ES6
\u{2257}
JSON
\u2257
Java
\u2257
Lua
\u{2257}
Matlab
char(8791)
Perl
"\x{2257}"
PHP
\u{2257}
PostgreSQL
U&'\2257'
PowerShell
`u{2257}
Python
\u2257
Ruby
\u{2257}
Rust
\u{2257}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)