This fish symbol represents the people of the early church. After the death and resurrection of Jesus Christ, the early church fell under extreme persecution which caused people to spread throughout the world. These followers of Christ were later nicknamed "Christians" because of their Christ likeness in the way they lived their lives.
Archeologists have found in their diggings, the fish and the cross symbols engraved in the walls of small store front buildings. These businesses were believed to be operated by Christian business men of that day.
The symbols were primarily understood by other Christians who may be purchasing from that business that the owner is a follower of Christ. This helped bring the people of likemindedness together. It is said that a Christian meeting someone new would draw a single arc in the sand. If the other person was a Christian, he or she would complete the drawing of a fish with a second arc. If the second person was not a Christian, the ambiguity of the half-symbol would not reveal the first person as a Christian.
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