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An inverted rounded U, denoting what two sets have in common.
Also known as: Cap, Upside-down U, Arch shape
∩ denotes the intersection of two sets: everything belonging to both. It is the union sign turned upside down, and the two are among the most frequently reversed symbols in mathematics.
Is encoded as U+2229 INTERSECTION in the Mathematical Operators block.
Contexts: Mathematics
Denotes the set of everything belonging to both of the two sets it joins.
Contexts: Mathematics
Is read aloud as 'cap', paired with 'cup' for the union sign — a naming convention that exists because the shapes alone are so easily reversed.
Contexts: Mathematics
A single stroke rising, curving across the top and descending again, forming an open-bottomed arch with legs of equal length.
Vertical reflection is the entire difference between them.
Everything in both sets, against everything in either.