What is the correct way of labeling artifact armor?

[Ryans]

Then it is AF+2, ya know cause 1+1=2

Also more then likely the next "Myth set" is going to follow the same trend and just be a re-color of the AF2 shown in the pictures. Least that is what we can assume. So AF2+1

Actually what am I saying? The next turns of Coil will have the Allagan2 pieces and then the new tome currency will be used to purchase AF2 most likely since I doubt there will be a quest chain to get them.

I don't think you can extrapolate a pattern from one instance. We don't even know how AF2 is going to be introduced let alone if there will be a recolored version of it. It might be dropped from coil 6-10 for all we know. Maybe it will do a similar move to FFXI and have bosses drop an item that can be turned into a specific piece of AF2 after you've obtained 5 of them (for example).