Why do the Boston Atheists use an asterisk for their logo?

The simply-drawn asterisk is iconic, in the same way that the Christian cross, the Muslim star & crescent, the Buddhist dharma wheel, the Hindu pranava, and the Jewish shield all are, and like them is practical for use as a logo.

The asterisk, when used as a punctuation marking, indicates that there is something that needs to be explained about our atheism. Following the word "atheist," the asterisk signals a footnote which explains that we aren't *merely* atheists -- but also diverse and decent people: students, parents, professionals, humanists, musicians, sports fans, etc. It is therefore useful as a way of expressing that we don't want to be reduced to the fact of our atheism.

The starry mark refers to images in nature -- the Sun, enchinoderms -- that many atheists believe are more appropriate sources for that sense of wonder that theists seek from their relationship with a higher power. It is therefore affirming, instead of representing only anti-theism.