Why Icthyus in Christianity?
Icthyus is the Greek word for fish. It is spelled with the Greek
letters Iota, Chi, Theta, Upsilon, and Sigma.
Iota is the first letter in the Greek word Iesous, which means
Jesus.
Chi is the first letter in the Greek word Christos, which means
Christ.
Theta is the first letter in the Greek word Theou, which means
God.
Upsilon is the first letter in the Greek word Uios, which means
Son.
Sigma is the first letter in the Greek word Soter, which means
Savior.