What could be the writing behind ekko?

I love the skin art on ekko. However one thing completely caught my attention. It's the written notes behind ekko.

I'm sure they mean something. Why would Riot just give scribbled nothings behind ekko?

What could the language be? What does it say? WE MUST SOLVE THIS TOGETHER!

P.S. It looks very familiar too but I can't put my finger on it :Y

EDIT: After trying out ekko. I noticed that above his head when his ulti is active strange symbols appear on his past self. They look very similar to the writing in the back of ekko.