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Rho (upper case Ρ, lower case ρ) is a letter of the Greek alphabet. See Rho (letter). The lower-case letter rho (ρ) may represent:
- in mathematics, the radius in a spherical coordinate system or spectral radius.
- in physics and engineering, the density of a material.
- in physics, the volume charge density.
- in physics, the resistivity of a material.
- in physics, the rho mesons, <math>\rho^+</math>, <math>\rho^0</math>, <math>\rho^-</math>.
- in biology, the Rho factor protein in RNA transcription termination.
- in biology, Rho GTPase, a small GTPase enzyme important in migration and stress fibre formation
- in mathematical finance, Rho is the sensitivity of an option or to changes in interest rates.
- in statistics, the Spearman's rank correlation (or rho) coefficient.
Rho is the name of several places:
- Rho, a town near Milan, Italy (not to be confused with Ro, Italy)
- the Rho, a Greek islet famous for its single resident, Despina Achladioti.
- Rho River, a river in the Frejus Valley
- Rhodes Diagoras International Airport, IATA code
Other:
- The Durst Rho, a series of large-format industrial inkjet printer marketed by Durst
- The Right-Hand Opponent in Contract Bridge (see Contract bridge glossary)
- Rho Cassiopeiae, a yellow hypergiant in the constellation Cassiopeia.
