The anagram is a code used to be recognized in hiding and today we carry it as a proclamation of faith
In the beginning it was not easy.
The apostles were immediately persecuted in a brutal way, following with massacres everywhere, the first Christians definitely lived their faith almost clandestinely.
In addition to taking precautions, the early Christians used "secret codes" to confirm whether they were before a person who shared their religion.
One of these codes was the "Ichthys" or "Ichthus", a word that in ancient Greek (ἰχθύς) means "fish."
Thus, the fish became one of the first Christian symbols, along with the image of the Good Shepherd.