I'm sorry if I sound rather dumb but what sort of connection are we supposed to be looking at here?
I see a lot of ancient civilizations using the same symbol, what exactly is that supposed to imply? Should we try to run a timeline comparison to see if that results in some sort of link
Of the top of my head the following are really weird
Etruscan
Peru
Navajo
Hittie
Korea
Japan
Aztec
Are all these groups more or less on the same longitude?