tau

Meanings

1. 1
   noun 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.
2. 2
   noun A Τ-shaped sign or structure; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
3. 3
   noun A tau meson, now usually known as a kaon.
4. 4
   noun An unstable heavy lepton, which decays into a muon or electron; a tauon.
5. 5
   noun Tau protein, a type of protein that stabilizes microtubules in the human central nervous system, failures of which are associated with forms of dementia.
6. 6
   noun A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.
7. 7
   noun An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, approximately 6.2831853071; equal to twice the value of pi. Often written τ or 2π.