Rho (upper case Ρ, lower case ρ) is a letter of the Greek alphabet. See Rho (letter). The Greek alphabet (Greek: ) is an alphabet consisting of 24 letters that has been used to write the Greek language since the late 8th or early 9th century BC. It was the first alphabet in the narrow sense, that is, a writing system using a separate symbol for each vowel... Look up Ρ, ρ in Wiktionary, the free dictionary. ...

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, ρ ⁺ , ρ⁰, ρ ⁻ .
• in biology, the Rho factor protein in RNA transcription termination.
• 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: A point plotted using the spherical coordinate system In mathematics, the spherical coordinate system is a coordinate system for representing geometric figures in three dimensions using three coordinates: the radial distance of a point from a fixed origin, the zenith angle from the positive z-axis, and the azimuth angle... In mathematics, the spectral radius of a matrix or a bounded linear operator is the supremum among the moduli of the elements in its spectrum, which is sometimes denoted by ρ(·). // Matrix Let λ1,...,λn be the (real or complex) eigenvalues of a matrix A. Then ρ(A) := max(|λi|) The spectral... For other uses, see Density (disambiguation). ... Charge density is the amount of electric charge per unit volume. ... Electrical resistivity (also known as specific electrical resistance) is a measure of how strongly a material opposes the flow of electric current. ... In particle physics, a rho meson is a short-lived hadronic particle that is an isospin triplet whose three states are denoted as . After the pions and kaons, the rho mesons are the lightest strongly interacting particle with a mass of roughly 770 MeV for all three states. ... A ρ factor (rho factor) is a protein found in prokaryotes, especially E. coli, involved in the termination of transcription. ... In mathematical finance, the Greeks are the quantities representing the market sensitivities of options or other derivatives. ... In statistics, Spearmans rank correlation coefficient, named after Charles Spearman and often denoted by the Greek letter ρ (rho), is a non-parametric measure of correlation – that is, it assesses how well an arbitrary monotonic function could describe the relationship between two variables, without making any assumptions about the frequency...

• 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: Rho is an Italian town near Milan, Italy. ... Type Anti-tank Nationality Joint France/Germany Era Cold War, modern Launch platform Individual, Vehicle Target Vehicle, Fortification History Builder MBDA, Bharat Dynamics (under license) Date of design 70s Production period since 1972 Service duration since 1972 Operators 41 countries Variants MILAN 1, MILAN 2, MILAN 2T, MILAN 3, MILAN... Ro is a comune (municipality) in the Province of Ferrara in the Italian region Emilia-Romagna, located about 60 km northeast of Bologna and about 15 km northeast of Ferrara. ... Rho is a small Greek island in the Aegean Sea near Kastellórizo and less than 800 m from the Turkish coast. ... Despina Achladioti was a Greek patriot born on the island of Kastellórizo in 1893. ... Rhodes International Airport, Diagoras (Greek: Κρατικός Αερολιμένας Ρόδου, Διαγόρας) or Diagoras International Airport (IATA: RHO, ICAO: LGRP) is located on the island of Rhodes in Greece. ...

• in biology, Rho GTP-binding protein, a small GTPase enzyme important in migration and stress fibre formation
• 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.