what is the mark of a backwards N inside a circle?
LoL I don't know if its to late or not, but it's a sign for Nihilism.
The previous guest was correct when he said that Backwards N found inside a circle stands for Nihilism but to complete the information given here it is.
Nihilism is the rejection of religious and moral beliefs. Therefore it is non-Christian in origin and if define in one word literally means nothingness from the Latin word Nihil. It was closely connected to Hitler’s power mad last 4 years of rule.
I found several symbols on this site: http://nihilism.webstarts.com/.