I suppose this might also go on SuperUser, but I'm only interested in it insofar as implementing it in LaTeX, so I'll ask here.
I feel certain that I've seen PDF's where the actual PDF page number of (for example) the title page is not 1 or i, or any of the standard choices I know are possible in LaTeX, but rather the word "Title", like this:
(the numbering would then continue as usual, with the second page in the document being indicated as "1" in the white box, etc.)
This is only a mock-up, because unfortunately I can't find any examples of PDFs that are like this (perhaps I've only imagined it?) but hopefully I have specified the idea well enough, and I'd like to know if it's possible to do in LaTeX.