I can't find a topic dedicated to solely this, so I've made my own lol.

I have read posts in other topics that say that the O at the bottom and the black dot at the top represent heaven and hell, and that the O at the bottom supposedly links Pelafina to Yggdrasil, in that the signature in her letter on page 642 is Mmmy, and that this O is the missing letter...

Just wondering if anyone else has any ideas on what this is supposed to mean.