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An enlarged upside-down U with limits, intersecting a family.
Also known as: N-ary intersection, Intersection over a family, Indexed intersection
The enlarged intersection sign takes the intersection of an entire indexed family: everything belonging to every member at once. Over an empty family it is undefined without a fixed universe, which is the technical caveat a careful text states.
Denotes the intersection of an indexed family of sets: the elements belonging to every member of the family.
Contexts: Mathematics
Is left undefined over an empty family unless a universal set is fixed, because otherwise it would name the set of everything.
Contexts: Mathematics
A large arch like an upside-down U, taller than the surrounding letters, with small expressions set below and above it.