Everyone is familiar with the ichthyic or ichthus from the greek ikhths the symbol consists of two intersecting arcs the ends of the right side extending beyond the meeting point so as to resemble the profile of a fish it was used by early christians as a secret christian symbol and now known colloquially as the sign of the fish or the jesus fish later the symbol was altered to include legs and the word darwin by supporters of his scientific theory of evolution weve taken that theory