The diagram shows two sets, labeled A and B, within a universal set (the rectangle). The shaded area corresponds to the region outside of set $A$, while it still includes some parts of set $B$.

This shaded area is represented by $A'$, which means "not A" or the complement of set $A$. Hence, the correct answer is:

• A'.

Would you like further clarification on Venn diagrams or set operations?

Here are some related questions:

1. What is the complement of a set in set theory?
2. How do you represent the union of two sets in a Venn diagram?
3. What does $A \cap B$ (intersection of two sets) represent in a Venn diagram?
4. Can a Venn diagram have more than two sets? How does it change visually?
5. What does the shaded region in a Venn diagram represent mathematically?

Tip: The complement of a set $A$, denoted $A'$, includes everything in the universal set except the elements of $A$.