There's a bunch of eye symbols in Zelda, actually, and only one of them is definitely Sheikah-related. It's the one with the teardrop. The other instances of eyes
may relate, but if they do it's uncertain.
Anyway my favorite symbol just for how it looks is probably the Gerudo one:
It's just a neat little face symbol, I think. Looks like a little bandit koopa or something.
I think it's an odd symbol for the Gerudo, but not necessary unfitting, and at least an interesting one.
I especially like the creepy seething thorned one that appears on Zant's clothes: