Alphabetical puzzle

Hello everyone. I’m looking for help to solve an enigma. I think this is a simple conversion to alphabetical symbols but I cannot find anything on Google.
Any idea? I hope it’s on the good category.

Thanks a lot.


Hello Gouns Mathieu.
I guess you could try searching ancient Greek alphabets and numbers. Maybe it could help.
By the way could I ask a question I hope I am not bothering you but from where did you get this puzzle ,it is quite confusing.

Best wishes.

Where is it from? (Letter frequencies vary by language.)

There might be some ideas on the page below.

I would guess that it is numerical and not alphabetical.