U+2288 Neither A Subset of Nor Equal To
U+2288 was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Math Symbol and is commonly used, that is, in no specific script.
The glyph is a canonical composition of the glyphs
The Wikipedia has the following information about this codepoint:
In mathematics, a set A is a subset of a set B if all elements of A are also elements of B; B is then a superset of A. It is possible for A and B to be equal; if they are unequal, then A is a proper subset of B. The relationship of one set being a subset of another is called inclusion (or sometimes containment). A is a subset of B may also be expressed as B includes (or contains) A or A is included (or contained) in B. A ksubset is a subset with k elements.
The subset relation defines a partial order on sets. In fact, the subsets of a given set form a Boolean algebra under the subset relation, in which the join and meet are given by intersection and union, and the subset relation itself is the Boolean inclusion relation.
Representations
System  Representation 

Nº  8840 
UTF8  E2 8A 88 
UTF16  22 88 
UTF32  00 00 22 88 
URLQuoted  %E2%8A%88 
HTML hex reference  ⊈ 
Wrong windows1252 Mojibake  âŠˆ 
HTML named entity  ⊈ 
HTML named entity  ⊈ 
HTML named entity  ⊈ 
L^{A}T_{E}X  \not\subseteq 
Related Characters
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
NEITHER A SUBSET OF NOR EQUAL TO  
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Mathematical Operators  
Math Symbol  
Common  
Other Neutral  
Not Reordered  
canonical  


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Any  
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None  
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R 