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An enlarged sideways U with limits, taking the union of a family.
Also known as: N-ary union, Union over a family, Indexed union
The enlarged union sign takes the union of a whole indexed family at once, in the way an enlarged sigma sums a family. The limits below and above it index the family, and an unlimited version reads as the union of everything in a named collection.
Denotes the union of an indexed family of sets: everything belonging to at least one member of the family.
Contexts: Mathematics
Carries its index below and its bound above, in the same way the summation and product signs do, and may instead carry a named collection beneath it.
Contexts: Mathematics
A large sideways U opening upwards, taller than the surrounding letters, with small expressions set below and above it.