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A rounded U shape, denoting everything in either of two sets.
Also known as: Cup, U shape
∪ denotes the union of two sets: everything that belongs to at least one of them. It is easily reversed with the intersection sign, which is the same shape upside down.
Is encoded as U+222A UNION in the Mathematical Operators block.
Contexts: Mathematics
Denotes the set of everything belonging to at least one of the two sets it joins.
Contexts: Mathematics
Is read aloud as 'cup', a name that distinguishes it from the letter U and from the intersection sign read as 'cap'.
Contexts: Mathematics
A single stroke descending, curving along the bottom and rising again, forming an open-topped rounded U with arms of equal height.
The same shape inverted; which way up it sits is the whole distinction.
Everything in either set, against everything in both.