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+225D forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definitions (which try to list the objects that a term describes). Another important category of definitions is the class of ostensive definitions, which convey the meaning of a term by pointing out examples. A term may have many different senses and multiple meanings, and thus require multiple definitions.
In mathematics, a definition is used to give a precise meaning to a new term, by describing a condition which unambiguously qualifies what the mathematical term is and is not. Definitions and axioms form the basis on which all of modern mathematics is to be constructed.
Representations
System
Representation (click value to copy)
Nº
8797
UTF-8
E2 89 9D
UTF-16
22 5D
UTF-32
00 00 22 5D
URL-Quoted
%E2%89%9D
HTML hex reference
≝
Wrong windows-1252 Mojibake
â‰
Encoding: GB18030 (hex bytes)
81 36 D8 34
RFC 5137
\u'225D'
Bash and Zsh inside echo -e
\u225D
C and C++
\u225D
C#
\u225D
CSS
\00225D
Excel
=UNICHAR(8797)
Go
\u225D
JavaScript
\u225D
Modern JavaScript since ES6
\u{225d}
JSON
\u225D
Java
\u225D
Lua
\u{225D}
Matlab
char(8797)
Perl
"\x{225D}"
PHP
\u{225d}
PostgreSQL
U&'\225D'
PowerShell
`u{225D}
Python
\u225D
Ruby
\u{225d}
Rust
\u{225d}
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