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+22C4 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 number theory, the diamond operators 〈d〉 are operators acting on the space of modular forms for the group Γ1(N), given by the action of a matrix (a b c δ) in Γ0(N) where δ ≈ d mod N. The diamond operators form an abelian group and commute with the Hecke operators.
Representations
System
Representation (click value to copy)
Nº
8900
UTF-8
E2 8B 84
UTF-16
22 C4
UTF-32
00 00 22 C4
URL-Quoted
%E2%8B%84
HTML hex reference
⋄
Wrong windows-1252 Mojibake
â‹„
HTML named entity
⋄
HTML named entity
⋄
HTML named entity
⋄
Encoding: GB18030 (hex bytes)
81 36 E1 35
LATEX
\diamond
RFC 5137
\u'22C4'
Bash and Zsh inside echo -e
\u22C4
C and C++
\u22C4
C#
\u22C4
CSS
\0022C4
Excel
=UNICHAR(8900)
Go
\u22C4
JavaScript
\u22C4
Modern JavaScript since ES6
\u{22c4}
JSON
\u22C4
Java
\u22C4
Lua
\u{22C4}
Matlab
char(8900)
Perl
"\x{22C4}"
PHP
\u{22c4}
PostgreSQL
U&'\22C4'
PowerShell
`u{22C4}
Python
\u22C4
Ruby
\u{22c4}
Rust
\u{22c4}
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.)