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http://www.invisiblepinkunicorn.com/

The Invisible Pink Unicorn logo represents atheism.

It is a fusion between the mathematical void symbol and the stylized 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.