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The U symbol indicates a Union in set notation. This means that the resulting set is the combination of all unique items in the sets on either side of the symbol.
Given two or more sets there is a set which is their union and a set which is there intersection. But, there is no such thing as a "union intersection set", as required for the answer to the question.
shift + u
Yes. Union is an operation in which all the members of any two sets are placed in a common set. The union operation can be applied to the null set and any set but since it has no members, it does not change the set the union is taken with. It is rather like adding 0 to a number.
what symbol do you use when you automatically want to add a set of numbers together? the plus symbol + ?