What is filter paper? A recipe that I'm trying to make says: "Place mixture into a loaf pan that has been sprayed with pan release and lined with filter paper."

I'm pretty sure that "pan release" is the generic version of PAM, but I don't know what filter paper is. Is it another word for wax paper?

A quick search turned up a bunch of coffee filters and lab equipment.
I would assume it's a synonym for parchment paper.  And yes, pan release is a generic term for any food release spray.