Project Reason Button

From The Project Reason WebsiteProbably my favorite atheist quote is “Atheism is a belief like not collecting stamps is a hobby.” So I was thinking, what would be the best symbol or logo to put on a pin? I do really like Dawkins’ scarlet letter A, but I feel a littlle confrontational when I wear mine, and I pick and choose the venues for it. How about a blank white button as an