the nineteenth letter of the Greek alphabet (?, ?)
Origin of tauMiddle English taw, tau (esp. with reference, refer to the tau cross) ; from Classical Latin tau ; from Classical Greek ; from Sem, as in Classical Hebrew (language) tav, tav
The 19th letter of the Greek alphabet. See Table at alphabet.
Origin of tauGreek, of Phoenician origin; see tww in Semitic roots.
- The name of the letter Î¤/Ï„ 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.
- A Î¤-shaped sign or structure; a St. Anthony's cross, sometimes considered as a sacred symbol.
- (physics, dated) A tau meson, now usually known as a kaon.
- (physics) An unstable heavy lepton, which decays into a muon or electron; a tauon.
- (biology) A type of protein used to stabilise microtubules.
- (mathematics, neologism) A constant equal to twice the value of pi; often written Ï„.
From Ancient Greek Ï„Î±á¿¦ (tau).