The fish was a symbol of the Lord Jesus Christ and Christians.
The Greek letters of the word "fish" correspond to the initials of the words: "Jesus Christ the Son of God, our Saviour."
A secret sign used by the early persecuted Christians to designate themselves as believers in Jesus Christ.
Dictionary of church terms. — St. GEORGE'S COPTIC ORTHODOX CHURCH SPORTING - ALEXANDRIA EGYPT. Fr. Tadros Yacoub Maiaty.