The fish is the second most common Christian symbol after the cross itself. The fish symbol is based on a Greek acronym for Jesus Christ. To make the point clearer, some Christian fish symbols include the Greek letters inside or under the fish. Fish also appear in the Bible when Jesus provides fish for his Disciples in Luke and John. The feeding of the five thousand and the four thousand in Matthew also involved fish lunches. In the Bible, fish are a symbol of prosperity and abundance.