What does the set intersection symbol represent?

The set intersection symbol represents all of the numbers that are common to two sets. When we talk about the intersection of sets, we are specifically identifying the elements that appear in both sets simultaneously. For example, if one set contains the numbers {1, 2, 3} and another set contains {2, 3, 4}, the intersection will include only the numbers {2, 3}. This aspect is crucial in set theory as it allows for the analysis of relationships between different sets.

In contrast, the other possibilities do not accurately describe the intersection: it does not include all numbers from both sets nor does it focus solely on the numbers from just one set or suggest that no numbers are included. Instead, the intersection emphasizes the shared elements, reinforcing the idea of commonality between sets. This understanding is fundamental when working with mathematical sets and their relationships.