# What does that big U symbol mean

Dear Student!
The capital U denotes Union of sets.
Suppose you have no. of sets denoted by E1, E2, E3,........, En
Then their union is denoted by the given symbol $\underset{i=1}{\overset{n}{\cup }}{E}_{i}$ which simply means EU E2 U E3........U En
Regards

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