"In 2003 I wanted to create a symbol for atheism and simply put it out there."
- Tim Ahrentløv
The symbol was designed to be part logic and part story. The resulting IPU logo is a fusion between the mathematical void symbol and the stylised representation of an unicorn.
The void symbol (empty set Ø) is an allusion to nothingness and in this case meaning "no faith" or "no god".
The unicorn is a reference to a kind of story that atheists often tell to make their point. In this case one of the first stories to circulate the Internet newsgroups: The Invisible Pink Unicorn or IPU for short.
Believers often employs the "God did it" explanation whenever some phenomena is left unexplained by science, thus using the lack of evidence as evidence for God. Internet non-believers has been known to dignify such defective reasoning with a "The Invisible Pink Unicorn did it" reply to illustrate the lack of explanatory power.