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Icthus (Greek: ἰχθύς / ΙΧΘΥΣ) is a symbol of a person who believes in Jesus, a Christian, meaning "fish." Each alphabet of this Koine Greek word stands for "Jesus Christ God’s Son Savior."

1. Ι: Iota: Ιησους (Iēsous) / Jesus

2. Χ: Chi: Χριστος (Christos) / Christ (anointed)　

3. Θ: Theta: Θεου (Theou) / God’s / the genitive case of “Θεóς (God)" 

4. Υ: Upsilon: Υιος (hyios) / Son　

5. Σ: Sigma: Σωτηρ (sōtēr) / Savior