Answer :
Symbols UsedSet notation refers to the specific symbols used to tell people you are talking about sets of things. Sets are written with curly brackets and commas separating each item in the set..The above are two examples of sets. The first lists objects and the second uses numbers. You can substitute numbers or symbols for your objects if you wanted to write it in a shorter manner.To denote the union of sets, a symbol that looks like the letter u is used. You can write out both sets or you can label each set with a name and write it with the names instead.Union of sets notation.The above are two examples of sets. The first lists objects and the second uses numbers. You can substitute numbers or symbols for your objects if you wanted to write it in a shorter manner.To denote the union of sets, a symbol that looks like the letter u is used. You can write out both sets or you can label each set with a name and write it with the names instead.Union of sets notation.