I've barely been to Bavaria, and don't remember the restrooms or conspicuous lack of grafitti. But the parts of Deutschland I see the most - Frankfurt and Hamburg - are covered in scribbles! Sometimes I see teams of official-looking people Crayola-ing all over the walls!
I knew which symbol you meant. You don't seem to be the type to spot the symbol for electrical resistance in something. Much more likely that you meant the 'everything is born. everything lives. everything dies. everything is born again.' symbol.