Union Symbol
The set union symbol, also called the cup symbol, represents the union operator in set theory. For example, the union of the two sets A and B is represented as:
This would be said as the union of A and B.
Symbol  Format  Data 

∪  Unicode 

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SVG 
Usage
Union  Operator
The set union operation is denoted using the cup symbol. The union of two sets returns the combined elements of both sets. Duplicates are ignored.