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 Description  
 Union of Sets:  The set of all elements that belong to at least one of the given two or more sets.

In other words, the union is formed by putting all the elements in the given sets together. For example, if H = {0, 3, 6, 9} and J = {0, 6, 12} then the union of H and J is {0, 3, 6, 9, 12} and is written H  J.

Notice in the example above that 0 and 6 are in both H and J, but they are only listed once in the union set.