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  2. Spherical coordinate system - Wikipedia

    en.wikipedia.org/wiki/Spherical_coordinate_system

    the polar angle θ between this radial line and a given polar axis; [a] and; the azimuthal angle φ, which is the angle of rotation of the radial line around the polar axis. [b] (See graphic regarding the "physics convention".)

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

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

    theta functions; the angle of a scattered photon during a Compton scattering interaction; the angular displacement of a particle rotating about an axis; the Watterson estimator in population genetics; the thermal resistance between two bodies; ϑ ("script theta"), the cursive form of theta, often used in handwriting, represents

  4. Greek alphabet - Wikipedia

    en.wikipedia.org/wiki/Greek_alphabet

    Between Ancient and Modern Greek, they have remained largely unchanged, except that their pronunciation has followed regular sound changes along with other words (for instance, in the name of beta, ancient /b/ regularly changed to modern /v/, and ancient /ɛː/ to modern /i/, resulting in the modern pronunciation vita).

  5. Phi - Wikipedia

    en.wikipedia.org/wiki/Phi

    Phi (/ f aɪ /; [1] uppercase Φ, lowercase φ or ϕ; Ancient Greek: ϕεῖ pheî; Modern Greek: φι fi) is the twenty-first letter of the Greek alphabet. In Archaic and Classical Greek (c. 9th to 4th century BC), it represented an aspirated voiceless bilabial plosive ( [pʰ] ), which was the origin of its usual romanization as ph .

  6. List of Chi Omega chapters - Wikipedia

    en.wikipedia.org/wiki/List_of_Chi_Omega_chapters

    This is the list of Chi Omega chapters.Chi Omega's first series chapters (single-letter) are named for 24 of the Greek letters and assigned in an order customized to Chi Omega, approximating a reverse alphabetical order.

  7. What do teens mean when they say ‘sigma’? - AOL

    www.aol.com/news/teens-mean-sigma-000158935.html

    Sigma males are “considered ‘equal’ to Alphas on the hierarchy but live outside of the hierarchy by choice,” reads the website. Urban Dictionary adds that sigma “is what all 10 year olds ...

  8. Greeks (finance) - Wikipedia

    en.wikipedia.org/wiki/Greeks_(finance)

    In mathematical finance, the Greeks are the quantities (known in calculus as partial derivatives; first-order or higher) representing the sensitivity of the price of a derivative instrument such as an option to changes in one or more underlying parameters on which the value of an instrument or portfolio of financial instruments is dependent.

  9. National Pan-Hellenic Council - Wikipedia

    en.wikipedia.org/wiki/National_Pan-Hellenic_Council

    The council's membership expanded as Alpha Phi Alpha (1931), Phi Beta Sigma (1931), Sigma Gamma Rho (1937), and Iota Phi Theta (1996) later joined. [5] In his book on BGLOs, The Divine Nine: The History of African-American Fraternities and Sororities in America (2001), Lawrence Ross coined the phrase "The Divine Nine" when referring to the ...