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 mirrored. The word that U+221B forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In mathematics, the radical symbol, radical sign, root symbol, radix, or surd is a symbol for the square root or higher-order root of a number. The square root of a number x is written as
while the nth root of x is written as
It is also used for other meanings in more advanced mathematics, such as the radical of an ideal.
In linguistics, the symbol is used to denote a root word.
Representations
System
Representation (click value to copy)
Nº
8731
UTF-8
E2 88 9B
UTF-16
22 1B
UTF-32
00 00 22 1B
URL-Quoted
%E2%88%9B
HTML hex reference
∛
Wrong windows-1252 Mojibake
∛
Encoding: GB18030 (hex bytes)
81 36 D3 38
RFC 5137
\u'221B'
Bash and Zsh inside echo -e
\u221B
C and C++
\u221B
C#
\u221B
CSS
\00221B
Excel
=UNICHAR(8731)
Go
\u221B
JavaScript
\u221B
Modern JavaScript since ES6
\u{221b}
JSON
\u221B
Java
\u221B
Lua
\u{221B}
Matlab
char(8731)
Perl
"\x{221B}"
PHP
\u{221b}
PostgreSQL
U&'\221B'
PowerShell
`u{221B}
Python
\u221B
Ruby
\u{221b}
Rust
\u{221b}
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