Well, see, if I was writing a show, I would only put symbols in if I wanted them to mean something.
However, the symbols were written bya crazy old mad scientist so only some will actually be relevant, and in films, these appear as only a few symbols, single ones, or prominent/larger ones within a cluster, like a lot bigger.
(Jesus Christ I feel like a tvtropes fag).
But anyway, don't read too far because were they mean to reveal anything or mean anything? If they weren't, well, not a big deal, the show had enough mystery an intrigue as it is.
To me, it's a bit like the conspiracy dickheads who pore over single photos on Mars taken by Curiosity that show a weird object that looks like it could be artificial and suggest aliens if you look at the blurry image in the right way (like, the gun image, which was a rock!), whilst missing out on all the cool shit she's beaming back, like the Blue Sunrise, and all the new data like the stratified map of mineral deposits we could use to build shit when we get there, etc. etc.
Don't be like that.