title_body: What symbols/text to use for index references?
upvoted_answer: I have created an index for an nonfiction title before (a technical manual), and I think indices do serve a purpose -- and by the way, I created an author index too! 
  
  The key thing is making sure the links themselves are large enough that you can click each separate link and not get the wrong one. You should consider increasing the horizontal space between  entries. Separating things by commas also should help. 
  
  I don't think which character you use really matters -- though I prefer the symbols.  I have used as a label a name of a chapter or section or subsection.