So here we have an ancient peace symbol thats meaning was changed and is now recognised as a "evil" symbol across the world.

The crucifix, once a symbol that was feared as it was a cruel means of punishment...now one of the most recognised symbols all over the world that represents Christianity.

Again the pentagram, only till a few hundred years ago did Satanics start using this symbol for their religion, it used to be a holy symbol before that.

The skull and crossbones, usually asscoiated with poison and danger, this symbol has many different meanings over the years including pirates!, but usually it is always associated with danger.

ROCK ONNNN \m/>.<"

this symbol is actually a symbol for the devil, but now is commonly used as a 

"rock on" expression.