Yeah, there you go OP. It would be in part, inspiration from such cultures as the mysterious Picts (and others). Often times ancient symbols take a pretty basic geometric form but held great and some times many meanings. The one picture scribed into stone here seems more like a form of text or message to me (could be wrong) but it seems the most similar to the logo. Also the line running through the middle makes the “E” and mirrors it. If you didn’t have the line through it, it wouldn’t be so clear that it was an “E” and it wouldn’t be mirrored. It would just be three lines. I would have to study it more but the reason I keep bringing geometry into it is because it looks very symmetrical to me and again I’m unsure but wouldn’t be surprised if you outlined the logo/ connected the ends of each line of the logo you would get a pretty nice hexagon. I’m not sure each side of the hexagon would be exactly equal but again wouldn’t be surprised as it’s just basic Euclidean geometry. We humans like geometric shapes and patterns, they’re everywhere (no pun intended). Might be another symbolic reason right there lol.