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The earliest followers of Jesus were persecuted and forced to worship in secret locations. They adopted a secret symbol as a means of identification between fellow Christians in a pagan world. The earliest followers of Jesus were persecuted and forced to worship in hidden locations. Often these believers would scratch the secret symbol of a fish in the ground to help them identify other Christians.
Not only was fish a common food of the day, often used and referenced by Jesus during His ministry, but the letters which make up the Greek word for "fish" (IXØ U S ) also spell out a secret message about our Lord. I-Jesus, X-Christ, Ø -Gods, U -Son, S -Savior.