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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.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
Archaic letter denoting the presence of /h/ prior to a long diphthong, with a normal or low pitch ᾏᾇ: Alpha with subscript iota and circumflex and rough breathing: Archaic letter denoting the presence of /h/ prior to a long diphthong, with a high or falling pitch Έέ: Epsilon with acute: High pitch on short vowel or rising pitch on long ...
Tau (Τ or τ) is the 19th letter of the Greek alphabet. Tau may also refer to: Mathematics. Tau (mathematical constant), a circle constant equal to 2 ...
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.
Taw, tav, or taf is the twenty-second and last letter of the Semitic abjads, including Arabic tāʾ ت , Aramaic taw 𐡕, Hebrew tav ת , Phoenician tāw 𐤕, and Syriac taw ܬ. In Arabic, it also gives rise to the derived letter ث ṯāʾ. Its original sound value is /t/. The Phoenician letter gave rise to the Greek tau (Τ), Latin ...
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.
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]