Rho (/ˈroʊ/ ; 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 the Phoenician letter resh 
. Its uppercase form uses the same glyph, Ρ, as the distinct Latin letter P; the two letters have different Unicode encodings.
⭐ Core Definition: Rho (letter)
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👉 Rho (letter) in the context of Electrical resistivity and conductivity
Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m). For example, if a 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.
Electrical conductivity (or specific conductance) is the reciprocal of electrical resistivity. It represents a material's ability to conduct electric current. It is commonly signified by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) and γ (gamma) are sometimes used. The SI unit of electrical conductivity is siemens per metre (S/m). Resistivity and conductivity are intensive properties of materials, giving the opposition of a standard cube of material to current. Electrical resistance and conductance are corresponding extensive properties that give the opposition of a specific object to electric current.
In this Dossier
Rho (letter) in the context of Ϻ
]........ΑΝ ΑΝΤΑΣ⁞ΧΑ.[
]....ΚΕΑΣ⁞ΑΝΓΑΡΙΟΣ[
]...ΑΥϜΙΟΣ⁞ΣΟΚΛΕΣ⁞[
].ΤΙΔΑΣ⁞ΑΜΥΝΤΑΣ[
]ΤΟΙ ΜΑΛΕϘΟ⁞ΚΑΙ.[
) in the word "ΑΜΥΝΤΑΣ".San (Ϻ) is an archaic letter of the Greek alphabet. Its shape is similar to Latin M and Greek mu (Μ), and can be described as a sigma (Σ) turned sideways. It was used as an alternative to sigma to denote the sound /s/. Unlike sigma, whose position in the alphabet is between rho and tau, san appeared between pi and koppa in alphabetic order. In addition to denoting the archaic character, the name "san" also came to be used for sigma itself.