Tau definitions

tou, tô
The 19th letter of the Greek alphabet.
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The nineteenth letter of the Greek alphabet (Τ, τ)
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The name of the letter Τ/τ in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient Greek.
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A Τ-shaped sign or structure; a St. Anthony's cross, sometimes considered as a sacred symbol.
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(physics, dated) A tau meson, now usually known as a kaon.
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(physics) An unstable heavy lepton, which decays into a muon or electron; a tauon.
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(biology) A type of protein used to stabilise microtubules.
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(mathematics, neologism) A constant equal to twice the value of pi; often written Ï„.
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Origin of tau

Greek of Phoenician origin tww in Semitic roots