tau

Meaning

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.
• A -shaped sign or structure; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
• A tau meson, now usually known as a kaon.
• An unstable heavy lepton, which decays into a muon or electron; a tauon.
• Tau protein, a type of protein that stabilizes microtubules in the human central nervous system, failures of which are associated with forms of dementia.
• A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.
• 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.

Related

Similar words

• kappa, vega

Broader meaning words

• Greeks

Origin

• Borrowed from Ancient Greek ταῦ. The physics sense was .