Charles Darwin, the Victorian scientist who came up with the idea of evolution and natural selection. The Darwin Fish is a counter-symbol used by some in the argument between Creationism and Evolution. Personally, I think the Darwin Fish symbol is a bad idea. Christianity and Creationism are not the same thing, and so using it is a bit of an insult. Note that I have a low opinion of Creationism and the current masquerade of Intelligent Design, and if there was a clearly Creationist symbol to mock, I would be using it.