User blog comment:Hinansho/What do you think the currently unknown epithets mean?/@comment-4207271-20131124001818

I think "A" stands for 'Auswählen', and refers to Yhwach being able to use it and Uryu surviving it. As for the others, The Explode is kinda obvious, as is The Heat, The Jail, The Overkill, The Question, The Roar and The Yourself. Only The Iron is yet to be explained properly, but that is likely to be explained relatively soon.