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+2251 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:
In mathematics, an equivalence relation is a binary relation that is reflexive, symmetric and transitive. The equipollence relation between line segments in geometry is a common example of an equivalence relation. A simpler example is equality. Any number is equal to itself (reflexive). If , then (symmetric). If and , then (transitive).
Each equivalence relation provides a partition of the underlying set into disjoint equivalence classes. Two elements of the given set are equivalent to each other if and only if they belong to the same equivalence class.
Representations
System
Representation (click value to copy)
Nº
8785
UTF-8
E2 89 91
UTF-16
22 51
UTF-32
00 00 22 51
URL-Quoted
%E2%89%91
HTML hex reference
≑
Wrong windows-1252 Mojibake
≑
HTML named entity
≑
HTML named entity
≑
Encoding: GB18030 (hex bytes)
81 36 D7 33
LATEX
\doteqdot
Adobe Glyph List
geometricallyequal
RFC 5137
\u'2251'
Bash and Zsh inside echo -e
\u2251
C and C++
\u2251
C#
\u2251
CSS
\002251
Excel
=UNICHAR(8785)
Go
\u2251
JavaScript
\u2251
Modern JavaScript since ES6
\u{2251}
JSON
\u2251
Java
\u2251
Lua
\u{2251}
Matlab
char(8785)
Perl
"\x{2251}"
PHP
\u{2251}
PostgreSQL
U&'\2251'
PowerShell
`u{2251}
Python
\u2251
Ruby
\u{2251}
Rust
\u{2251}
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