I know pedos use symbols and shit, but this here is the symbol for surfers against sewage (a great cause) and that symbol is quite clearly a wave. So not really notable or sick.
The center kind of looks like an eyeball, but due to the name of the organization one should infer that (((it is a wave.)))
Maybe it means the all seeing eye is catching a brown wave and we are going to clean it up.
I think most of the symbols you see aren't anything to do with some sinister sicko club. Get this: they are just neat looking designs. Geometric shapes that are extremely common. They only mean bad things to bad people.