What an awesome solidus @Sallent ! Here is my Zeno monogram, unlike @Finn235 's coin, mine doesn't even have a bump on the obverse anymore...so I didn't even take a pic of it.
Are you sure that's Zeno? I almost see a horizontal S in the middle... Could be the empress Aelia Zenonis?
I didn't even consider that! I really can't tell, I've been looking at it for the last 10 minutes with every magnifier I got. I think it is just a straight line across the N.