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  • Definition
    • tau : # {{ISO 639|3}}

      • tau : The letter in the Greek alphabet; being the nineteenth letter of the Classical and Modern Greek, and the twenty-first letter of the Old and Ancient Greek alphabets.

        • tau : ; the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac and Arabic.

          • tau : A -shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.

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          • Derivative