Torque, the rotational force in mechanics.Time constant (also relaxation time) of any system, such as an RC circuit.In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature.Tau in astronomy is a measure of optical depth, or how much sunlight cannot penetrate the atmosphere.Tau, an elementary particle in particle physics.The lifetime of a spontaneous emission process.Translation in Euclidean geometry (although the Latin letter T is used more often).Torsion of a curve in differential geometry.

Tau, circle constant equal to 2 ПЂ (6.28318.).Stopping time in stochastic processes.Kendall tau rank correlation coefficient in statistics.Golden ratio (1.618.), although П† ( phi) is more common.Divisor function in number theory, also denoted d or Пѓ 0.Tau in biochemistry, a protein associated with microtubules and implicated in neurodegenerative diseases such as Alzheimer's disease, some forms of frontotemporal lobar degeneration, and chronic traumatic encephalopathy.The core variable in general tau theory.The dose interval in pharmacokinetics.The expressed period of the freerunning rhythm of an animal, i.e., the length of the daily cycle of an animal when kept in constant light or constant darkness.The lower-case letter П„ is used as a symbol for: See also: Greek letters used in mathematics, science, and engineering В§В О¤П„ (tau)

Mathematica greek letters