qepHom 2015: You would not say nav wej for "page three", unless your talking about three separate sheets of paper. A "page" (like the page in a book, that you can number) is a tenwal. Maltz also wanted me to point out that tenwal ("page") is used only for numbered pages in a book or something similar. One side of a piece of paper is a Dop, so a piece of paper has two Dopmey. Usually, there is one tenwal per Dop, but page numbering can get confusing sometimes.

From Marc Okrand:
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San can be translated as either "fate" or "destiny" (and probably some other things).

For "parallel universe," I'd go with 'u' quq, using quq "happen simultaneously, be simultaneous." quq is okay for "parallel" (in this sense).

Just as a "parallel universe" can't exist by itself (there has to be a universe -- presumably ours -- that it's parallel to), a "simultaneous universe" can't exist by itself. In both cases, you can refer to one universe at a time -- you don't always have to mention both (or several). 

For "mirror universe," I suggest Dop "be opposite, antithetical, contradictory" (yes, this is a new word).  If they're not making a real distinction between "parallel" and "mirror" (that is, if they're using the words interchangeably), I'd stick with quq.

wej Dop minus three or negative three; compare 'u' Dop mirror universe