U+2294 Square Cup
U+2294 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 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+2294 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 mathematics, the disjoint union (or discriminated union) $A\bigsqcup B$ of the sets A and B is the set formed from the elements of A and B labelled (indexed) with the name of the set from which they come. So, an element belonging to both A and B appears twice in the disjoint union, with two different labels.
A disjoint union of an indexed family of sets $({A}_{i}:i\in I)$ is a set $A,$ often denoted by $\underset{i\in I}{\u2a06}{A}_{i},$ with an injection of each ${A}_{i}$ into $A,$ such that the images of these injections form a partition of $A$ (that is, each element of $A$ belongs to exactly one of these images). A disjoint union of a family of pairwise disjoint sets is their union.
In category theory, the disjoint union is the coproduct of the category of sets, and thus defined up to a bijection. In this context, the notation $\coprod _{i\in I}{A}_{i}$ is often used.
The disjoint union of two sets $A$ and $B$ is written with infix notation as $A\bigsqcup B$. Some authors use the alternative notation $A\uplus B$ or $A\cup \phantom{\rule{negativethinmathspace}{0ex}}\phantom{\rule{negativethinmathspace}{0ex}}\phantom{\rule{negativethinmathspace}{0ex}}\cdot \phantom{\rule{thinmathspace}{0ex}}B$ (along with the corresponding $\underset{i\in I}{\u2a04}{A}_{i}$ or ${\bigcup \phantom{\rule{negativethinmathspace}{0ex}}\phantom{\rule{negativethinmathspace}{0ex}}\phantom{\rule{negativethinmathspace}{0ex}}\cdot \phantom{\rule{thinmathspace}{0ex}}}_{i\in I}{A}_{i}$).
A standard way for building the disjoint union is to define $A$ as the set of ordered pairs $(x,i)$ such that $x\in {A}_{i},$ and the injection ${A}_{i}\to A$ as $x\mapsto (x,i).$
Representations
System  Representation 

Nº  8852 
UTF8  E2 8A 94 
UTF16  22 94 
UTF32  00 00 22 94 
URLQuoted  %E2%8A%94 
HTML hex reference  ⊔ 
Wrong windows1252 Mojibake  âŠ” 
HTML named entity  ⊔ 
HTML named entity  ⊔ 
L^{A}T_{E}X  \sqcup 
Related Characters
Confusables
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
SQUARE CUP  
—  
Mathematical Operators  
Math Symbol  
Common  
Other Neutral  
Not Reordered  
none  


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0  
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None  
neutral  
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—  
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none  
not a number  


R 