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the Pi function, i.e. the Gamma function when offset to coincide with the factorial; the complete elliptic integral of the third kind; the fundamental groupoid; osmotic pressure; represents: Archimedes' constant (more commonly just called Pi), the ratio of a circle's circumference to its diameter; the prime-counting function
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 Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC. [2] [3] It was derived from the earlier Phoenician alphabet, [4] and is the earliest known alphabetic script to have developed distinct letters for vowels as well as consonants. [5]
Tau-, Psi- and phi- type Greek terracotta figurines date back to 1450–1100 BC in Mycenaean Greece. They were typically small (about 10cm high), made of terracotta , and were found in tombs, shrines and settlement areas.
In ancient times, some local forms of the Greek alphabet used the chi instead of xi to represent the /ks/ sound. This was borrowed into the early Latin language, which led to the use of the letter X for the same sound in Latin, and many modern languages that use the Latin alphabet .
The Association of College Honor Societies (ACHS) is a voluntary association of national collegiate and post-graduate honor societies.It was established on December 30, 1925 by six organizations, including Alpha Omega Alpha, the Order of the Coif, Phi Beta Kappa, Phi Kappa Phi, Sigma Xi, and Tau Beta Pi.
Phi Sigma Pi, gender-inclusive national honor fraternity; Sigma Alpha Iota, women's music fraternity; Tau Beta Sigma, coeducational honorary band society; Theta Tau (1925–2018), coeducation professional engineering fraternity, permanently expelled [3]
Chi Delta Theta: ΧΔΘ: 1989 National Independent Asian, multicultural Active Chi Iota Pi: ΧΙΠ: 2004 National Independent Multicultural Active Chi Omega: ΧΩ: 1895 National NPC: Traditional Active Chi Upsilon Sigma: ΧΥΣ: 1980 National NALFO: Latina Active Clovia: 1931 National Independent 4-H origin Active Delta Delta Delta: ΔΔΔ ...