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Tau (/ ˈ t aʊ, ˈ t ɔː, ˈ t ɒ /; [1] uppercase Τ, lowercase τ or ; Greek: ταυ) is the nineteenth letter of the Greek alphabet, representing the voiceless dental or alveolar plosive IPA:. In the system of Greek numerals , it has a value of 300.
The tau (τ), also called the tau lepton, tau particle or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of 1 / 2 .Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin.
The two letters tau and rho can be found separately (not in ligature) as symbols already on early Christian ossuaries. [6] Tertullian (Contra Marcionem 3.22) explains the Tau as a symbol of salvation by identification with the sign which in Ezekiel 9:4 was marked on the forehead of the saved ones. [3]
The tau cross is a T-shaped cross, sometimes with all three ends of the cross expanded. [1] It is called a "tau cross" because it is shaped like the Greek letter tau, [2] which in its upper-case form has the same appearance as the Latin letter T.
In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. [1] [note 1] The time constant is the main characteristic unit of a first-order LTI system. It gives speed of the response.
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), ... Tau 6.28318 ...
Shear stress (often denoted by τ, Greek: tau) is the component of stress coplanar with a material cross section. It arises from the shear force, the component of force vector parallel to the material cross section. Normal stress, on the other hand, arises from the force vector component perpendicular to the material cross section on which it acts.
Cross (Tau) of the Order of Saint James of Altopascio. The Order's rule, however, does not mention the maintenance of bridges or roads. A similar tau-like symbol or cross was venerated at the same time by the Franciscans. It may have symbolised perfection, since taf was the last letter of the Hebrew alphabet. [34]