Split shutters are a design incorporating two ‘levels’ of hinged panels, a top and a bottom set. These can be folded back independently of each other, more commonly used to fold the top back and leave the bottom closed.
This is similar to the design of the half shutters, but means when closed you have a fully covered window.
This split does not have to be at exactly half way, often people put the split about two thirds of the way up to allow some unrestricted light – yet keeping nearly all their privacy. This is great for first floor windows or apartments.