User blog comment:Seieireppa/God Eater:Universitas, chapter 44: The Maxim of Possibility/@comment-14812118-20150722210729/@comment-1419424-20150722211754

I couldn't very well call her "the other Nanako," because the Nanako from GE∑TMoP was already "the other Nanako," and calling her "the OTHER other Nanako" would just be confusing and unwieldy. I was considering Nanako' (Nanako prime), but that would, again, apply to TMoP Nanako, and Nanako" (double prime) would have looked even weirder.

Clearly I should have called her "Nanako ( ͡° ͜ʖ ͡°)," with TMoP Nanako being "Nanako ( ͠° ͟ʖ ͡°)."