Turtle Necklace

Greek word?

On a necklace of a turtle, there is Greek letters and I have no idea what they mean. The letters are very small, and I can not read/speak Greek.

It looks like this, from what I can make out.

ΑΡXΕΑΩN

but the second A could be a “Δ”. I’m not sure.

so what does ΑΡXΕΑΩN or [...]