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A set that contains the elements that is under consideration

Milky Way GalaxyA typical universal set we might see in mathematics is the set of natural numbers as shown below:N = {1, 2, 3, 4, …}Boldface capital letters are sometimes used to identify certain number sets, such as N for natural numbers. We usually use braces to enclose a set. The ellipsis mark (…) tells us that the set of natural numbers goes on with no end, so this universal set is also an infinite set. However, universal sets can also be finite sets.Let's look at an example of a universal set that is finite. The set of all the presidents of the United States is an example of a universal set that is finite.