Display > Subdiv Surfaces

Vertices: Show vertex points on the selected primitive.
Edges: Show edges for the selected Subdiv surface.
Faces: Display points as faces for the selected Subdiv surface.
UVs: Show UVs for the selected primitive.
Normals (Shaded Mode): Show normals for the selected Subdiv surface. Normals only appear in shaded mode (Hotkey: 5).
UV Borders (Texture Editor): Highlights the UV borders only in the Texture Editor.
Hull/Rough/Medium/Fine: Displays objects at preset levels of quality. Selecting Medium or Fine slows the display and interactive performance, but improves image precision.

The options for these selections allows you to apply the setting to active objects or to all objects.