What is the yin - yang ?
Why has it recently been used in fashion?
And also, is there any specific group of people that stereotypically are offended by the symbol?
I did do my own research initially but it was a little confusing and lots of people said variously different answers.
Thanks.

Good place to start: Yin and yang - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Yin_yang)