The Rho reference article from the English Wikipedia on 24-Jul-2004
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Rho

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  1. Rho (upper case Ρ, lower case ρ) is a letter of the Greek alphabet. See Rho (letter).
  2. The lower-case letter ρ is used as the symbol for the radius in a polar coordinate system in mathematics.
  3. The lower-case letter ρ is used as the symbol for the density of a material in physics.
  4. The lower-case letter ρ is used as the symbol for the resistivity of a material in physics.

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