I am struggling to find the appropriate term to define everything related to a text that it is not the text, or the book as a physical object. I mean everything from websites to merchandising, video games, apps, etc. I don't think that it is paratext or peritext, and I am sure there must be a word that implies all these, but I can't find it. Any thoughts?
It does indeed seem that such a word ought to exist, but if it does I'm blanking it. Can you help?