They use them a lot in Japan, but I can't remember what they are called (in Japanese) and I have no idea what you would call them in English. They are just a clear coloured piece of plastic that you slide under your notebook page as you write to stop indents from your pen going onto the next page. Does anyone know what these would be called??
Shitajiki, pencil board, underlay
I have only heard them called page protectors. Hopes this helps.