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History of the Christian Fish Symbol
Ichthys (Greek: ἰχθύς, capitalized ΙΧΘΥΣ; also transliterated and Latinized as ichthys, icthus, ichthus or ikhthus; ichthus), is the Ancient and Classical Greek word for "fish."

Symbolic meaning of the Christian Fish Symbol
The use of the Ichthys symbol by early Christians appears to date from the end of the 1st century AD. Ichthus (ΙΧΘΥΣ) is an acronym, a word formed from the first letters of several words. It compiles to "Jesus Christ God's Son is Saviour" or "Jesus Christ God's Son Saviour", in ancient Greek "Ἰησοῦς Χριστός, Θεοῦ Υἱός, Σωτήρ"

Ι - Iota is the first letter of Iesous (Ιησους), Greek for Jesus.
Χ - Chi is the first letter of Christos (Χριστóς), Greek for "anointed".
Θ - Theta is the first letter of Theou (Θεοῦ), genitive case of Θεóς "God".
Υ - Upsilon is the first letter of Huios (Υἱός), Greek for Son.
Σ - Sigma is the first letter of Soter (Σωτήρ), Greek for Savior.

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