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  2. Rho - Wikipedia

    en.wikipedia.org/wiki/Rho

    Rho (/ ˈ r oʊ /; uppercase Ρ, lowercase ρ or ϱ; Greek: ρο or ρω) is the seventeenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 100. It is derived from Phoenician letter res .

  3. Spearman's rank correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Spearman's_rank_correlation...

    In statistics, Spearman's rank correlation coefficient or Spearman's ρ, named after Charles Spearman [1] and often denoted by the Greek letter (rho) or as , is a nonparametric measure of rank correlation (statistical dependence between the rankings of two variables).

  4. Dynamic pressure - Wikipedia

    en.wikipedia.org/wiki/Dynamic_pressure

    ρ (Greek letter rho) is the fluid mass density (e.g. in kg/m 3), and; u is the flow speed in m/s. It can be thought of as the fluid's kinetic energy per unit volume. For incompressible flow, the dynamic pressure of a fluid is the difference between its total pressure and static pressure. From Bernoulli's law, dynamic pressure is given by

  5. Chi Rho - Wikipedia

    en.wikipedia.org/wiki/Chi_Rho

    The Chi Rho (☧, English pronunciation / ˈ k aɪ ˈ r oʊ /; also known as chrismon [1]) is one of the earliest forms of the Christogram, formed by superimposing the first two (capital) letters—chi and rho (ΧΡ)—of the Greek ΧΡΙΣΤΟΣ (rom: Christos) in such a way that the vertical stroke of the rho intersects the center of the chi.

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

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

    the stack alphabet in the formal definition of a pushdown automaton, or the tape-alphabet in the formal definition of a Turing machine; the Feferman–Schütte ordinal Γ 0 [17] represents: the specific weight of substances; the lower incomplete gamma function; the third angle in a triangle, opposite the side c

  7. Christogram - Wikipedia

    en.wikipedia.org/wiki/Christogram

    Chrismon Chi-Rho symbol with Alpha and Omega on a 4th-century sarcophagus (Vatican Museums) A Christogram (Latin: Monogramma Christi) [a] is a monogram or combination of letters that forms an abbreviation for the name of Jesus Christ, traditionally used as a religious symbol within the Christian Church. One of the oldest Christograms is the Chi ...

  8. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    When the resistivity of a material has a directional component, the most general definition of resistivity must be used. It starts from the tensor-vector form of Ohm's law, which relates the electric field inside a material to the electric current flow. This equation is completely general, meaning it is valid in all cases, including those ...

  9. Staurogram - Wikipedia

    en.wikipedia.org/wiki/Staurogram

    The staurogram (⳨), also monogrammatic cross or tau-rho, [1] is a ligature composed of a superposition of the Greek letters tau (Τ) and rho (Ρ). Early occurrence and significance [ edit ]