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Concept
Tau
Summary
Tau 'tɔː,_'taʊ (uppercase Τ, lowercase τ, or ; ταυ taf) is the nineteenth letter of the Greek alphabet, representing the voiceless dental or alveolar plosive t. In the system of Greek numerals, it has a value of 300.
The name in English is pronounced taʊ or tɔː, but in Greek it is taf. This is because the pronunciation of the combination of Greek letters αυ can have the pronunciation of either [ai], [av] or [af], depending on what follows and if a diaeresis is present on the second vowel (see Greek orthography).
Tau was derived from the Phoenician letter taw (𐤕). Letters that arose from tau include Roman T and Cyrillic Te (Т, т).
The letter occupies the Unicode slots U+03C4 (lowercase) and U+03A4 (uppercase). In HTML, they can be produced with named entities (τ and Τ), decimal references (τ and Τ), or hexadecimal references (τ and Τ).
Greek letters used in mathematics, science, and engineering#Ττ (tau)
The lower-case letter τ is used as a symbol for:
Specific tax amount
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 dose interval in pharmacokinetics
The core variable in general tau theory
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
Divisor function in number theory, also denoted d or σ0
Golden ratio (1.618...), although φ (phi) is more common
Kendall tau rank correlation coefficient in statistics
Stopping time in stochastic processes.
Tau, the ratio of the circumference to the radius of a circle, which is equal to 2pi (6.28318...
Official source
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Ontological neighbourhood
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Greek alphabet
The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC. It is derived from the earlier Phoenician alphabet, and was the earliest known alphabetic script to have distinct letters for vowels as well as consonants. In Archaic and early Classical times, the Greek alphabet existed in many local variants, but, by the end of the 4th century BC, the Euclidean alphabet, with 24 letters, ordered from alpha to omega, had become standard and it is this version that is still used for Greek writing today.
Theta
Theta (UKˈθiːtə, USˈθeɪtə; uppercase: Θ or ; lowercase: θ or ; thē̂ta thɛ̂ːta; Modern: thī́ta ˈθita) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth . In the system of Greek numerals, it has a value of 9. In Ancient Greek, θ represented the aspirated voiceless dental plosive t̪h, but in Modern Greek it represents the voiceless dental fricative θ. In its archaic form, θ was written as a cross within a circle (as in the Etruscan or ), and later, as a line or point in circle ( or ).
Romanization of Greek
Romanization of Greek is the transliteration (letter-mapping) and/or transcription (sound-mapping) of text from the Greek alphabet into the Latin alphabet. The conventions for writing and romanizing Ancient Greek and Modern Greek differ markedly. The sound of the English letter B (/b/) was written as β in ancient Greek but is now written as the digraph μπ, while the modern β sounds like the English letter V (/v/) instead.