You can select the following options from the submenu. See also Show or hide components.
Shows the selected object(s).
Hotkey: Shift + H
Shows the last hidden selection.
Hotkey: Ctrl + Shift + H
Shows all hidden polygon components on the selected objects.
Hotkey: Ctrl + Alt + H
Additional options on the menu allow you to show other specific objects in the scene, such as stroke path curves, cameras, and fluids.