Describe the shaded and unshaded regions in the given Venn diagram using set notation.

The shaded region in the Venn diagram represents the elements that are common to both set H and set G. This is known as the intersection of H and G.
In set notation, the shaded region is $H \cap G$.

The unshaded region includes all elements within the universal set that are not part of the shaded region ($H \cap G$). This is the complement of the intersection of H and G.

In set notation, the unshaded region is:

This means "the complement of the intersection of H and G."

In words, the unshaded region represents all elements that are not in both H and G simultaneously. This includes elements that are only in H, only in G, or neither in H nor in G.

The unshaded region is $\boxed{\text{the complement of the intersection of H and G, or } (H \cap G)'}$.