The icons available and exactly what they do when you click them are based on your user Role.

View IconView: Click to see details for the object the icon is associated with
Edit IconEdit: Click to change details for the object.
Set Role IconSet Role: Click to assign a Role for the user within the Study.
Remove Icon Remove: Click to remove the object.
Restore IconRestore: Click the Restore icon to restore an object that was previously removed. (The icon appears only after object has been removed.)