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+2216 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 set theory, the complement of a set A, often denoted by (or A′), is the set of elements not in A.
When all elements in the universe, i.e. all elements under consideration, are considered to be members of a given set U, the absolute complement of A is the set of elements in U that are not in A.
The relative complement of A with respect to a set B, also termed the set difference of B and A, written is the set of elements in B that are not in A.
Representations
System
Representation (click value to copy)
Nº
8726
UTF-8
E2 88 96
UTF-16
22 16
UTF-32
00 00 22 16
URL-Quoted
%E2%88%96
HTML hex reference
∖
Wrong windows-1252 Mojibake
∖
HTML named entity
∖
HTML named entity
∖
HTML named entity
∖
HTML named entity
∖
HTML named entity
∖
Encoding: GB18030 (hex bytes)
81 36 D3 34
LATEX
\setminus
RFC 5137
\u'2216'
Bash and Zsh inside echo -e
\u2216
C and C++
\u2216
C#
\u2216
CSS
\002216
Excel
=UNICHAR(8726)
Go
\u2216
JavaScript
\u2216
Modern JavaScript since ES6
\u{2216}
JSON
\u2216
Java
\u2216
Lua
\u{2216}
Matlab
char(8726)
Perl
"\x{2216}"
PHP
\u{2216}
PostgreSQL
U&'\2216'
PowerShell
`u{2216}
Python
\u2216
Ruby
\u{2216}
Rust
\u{2216}
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