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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    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

  3. Phi phenomenon - Wikipedia

    en.wikipedia.org/wiki/Phi_phenomenon

    Example of beta movement. Phi phenomenon has long been confused with beta movement; however, the founder of Gestalt School of Psychology, Max Wertheimer, has distinguished the difference between them in 1912. While Phi phenomenon and Beta movement can be considered in the same category in a broader sense, they are quite distinct indeed.

  4. Angular frequency - Wikipedia

    en.wikipedia.org/wiki/Angular_frequency

    A sphere rotating around an axis. Points farther from the axis move faster, satisfying ω = v / r.. In physics, angular frequency (symbol ω), also called angular speed and angular rate, is a scalar measure of the angle rate (the angle per unit time) or the temporal rate of change of the phase argument of a sinusoidal waveform or sine function (for example, in oscillations and waves).

  5. Fraternities and sororities in Canada - Wikipedia

    en.wikipedia.org/wiki/Fraternities_and...

    Omega Sigma Chi ΩΣΧ: O-Sigs April 12, 2010: Brock University: Social Local Independent 1 Active [41] [42] Phi Sigma Sigma: ΦΣΣ: Phi sigs November 26, 1913: Hunter College: Social International NPC: 0 Inactive Pi Alpha Gamma ΠΑΓ: October 18, 2011: St Thomas University: Social Local Independent 0 Inactive [43] Pi Beta Phi: ΠΒΦ: Pi Phi ...

  6. Phi Omega Pi - Wikipedia

    en.wikipedia.org/wiki/Phi_Omega_Pi

    In 1933, Phi Omega Pi dropped the Masonic requirement and was thus given full membership into the National Panhellenic Conference. [3] That same year, the sorority absorbed two other organizations. Sigma Phi Beta was a national group with ten chapters.

  7. Association of College Honor Societies - Wikipedia

    en.wikipedia.org/wiki/Association_of_College...

    Representatives of Alpha Omega Alpha, the Order of the Coif, Phi Beta Kappa, and Sigma Xi attended its preliminary meeting held on October 2, 1925. When ACHS was officially established on December 30, 1925, its founding members were Alpha Omega Alpha, the Order of the Coif, Phi Beta Kappa, Phi Kappa Phi, Sigma Xi, and Tau Beta Pi. [2]

  8. Pi helix - Wikipedia

    en.wikipedia.org/wiki/Pi_helix

    A pi helix (or π-helix) is a type of secondary structure found in proteins. Discovered by crystallographer Barbara Low in 1952 [ 1 ] and once thought to be rare, short π-helices are found in 15% of known protein structures and are believed to be an evolutionary adaptation derived by the insertion of a single amino acid into an α-helix . [ 2 ]

  9. Beta Theta Pi - Wikipedia

    en.wikipedia.org/wiki/Beta_Theta_Pi

    Beta Theta Pi (ΒΘΠ), commonly known as Beta, is a North American social fraternity that was founded in 1839 at Miami University in Oxford, Ohio. One of North America's oldest fraternities, as of August 2023 it consists of 150 active chapters and colonies in the United States and Canada. [ 1 ]