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  1. The name of the letter T in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical Greek, Classical and Modern Greek, the twentieth letter of Old Greek, Old and Ancient Greek, Ancient Greek.
    • Letter of the Greek alphabet: '''Τ Ï
    • Previous: sigma, Σ
    • Next: upsilon, Î¥
      1. A (polytonic, Τ)-shaped sign or structure; a St. Anthony's cross, sometimes considered as a sacred symbol.
    • 1658: Nor shall we take in the mysticall Tau, or the Crosse of our blessed Saviour, which having in some descriptions an Empedon or crossing foot-stay, made not one single transversion. " Sir Thomas Browne, The Garden of Cyrus (Folio Society 2007, p. 168)
      1. (context, particles, dated) A tau meson, now usually known as a kaon.
      2. (particles) An unstable heavy lepton, which decays into a muon or electron.
    Etymology: From Ancient Greek (polytonic, á).

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