Found the following art piece.
Not sure who, what, and where did it come from.
In the center it has characters that spell "A /\ <- € A"
Maybe it's a greek mythological warrior?
I would ask at the museum closest to you. There's no way to say for me to guess with just one figure & a letter but Greek art is known for nude warriors. Where you found it & a archeologist dating the stone might help in identifying where it certainly from and if there are more such reliefs out there.