Question: what is the biblical meaning of the fish symbol?
Answer: ΙΧΘΥΣ (ichthys), or also ΙΧΘΥϹ with a lunate sigma, is an acronym or acrostic for Iēsous Christos, Theou Yios, Sōtēr; contemporary Koine, which translates into English as 'Jesus Christ, Son of God, [Our] Savior'. Iota (i) is the first letter of Iēsous (Ἰησοῦς), Greek for "Jesus".