Rho

The title of this article is ambiguous. Other uses, see RHO listed

Rho
pronunciation
antique	[ r, rʰ ] ​​
modern	[ r ] ​​
Equivalents
Latin	R.
Cyrillic	Р
Hebrew	ר
Arabic	ر
Phoenician	?
transcription
From the ancient world	r (rh)
From the modern	r
Coding Capitals Unicode number U + 03A1 Unicode name GREEK CAPITAL LETTER RHO HTML & # 929; HTML entity & Rho; Minuscule Unicode number U + 03C1 Unicode name GREEK SMALL LETTER RHO HTML & # 961; HTML entity & rho; variant Unicode number U + 03F1 Unicode name GREEK RHO SYMBOL HTML & # 1009; HTML entity -

The Rho ( modern Greek neuter Ρω , uppercase Ρ, minuscule ρ or ϱ) is the 17th letter of the Greek alphabet and, according to the Milesian principle, has a numerical value of 100.

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

There is no evidence for the following statement, especially with regard to foreign words.

• Liddell & Scott ( A Greek-English Lexicon , 4th ed., 1855) list ᾿Ρᾶρος, ᾿Ράριος with Spiritus lenis, but also mention ῾Ράρος (with Spiritus asper) in the former, and write for the letter Rho: "Ρ, ρ [...] C. if ρ begins a word, it takes the rough breathing, except only in ῾Ράρος and ᾿Ράριος: though indeed in Aeol. Ρ was never aspirated ".
  In some digitized works it is similar ( LSJ, A Greek-English Lexicon & LS, An Intermediate Greek-English Lexicon have "Ρ̓ᾶρος" and "*) ra = ros", i.e. capitalized r with Spiritus lenis).
• For names like Raphael, a Greek origin * ᾿Ραφαήλ (with Spiritus lenis) instead of ῾Ραφαήλ (with Spiritus asper) would be conceivable, which could possibly also fit better with Hebrew. Liddell & Scott do not list the word - possibly because it is too young - i.e. H. the statement by Liddell & Scott with the two exceptions is not necessarily correct for later periods.

At the beginning of an ancient Greek word it is always aspirated / breathed e.g. B. ῥέω (rhéō) I flow .

use

• In physics , that's little Rho
  • the symbol for the density , for example the mass density of water (~) 1 kilogram per liter,
  • and that for the specific electrical resistance , a temperature-dependent material constant,
  • the identifier of a meson ,
  • the symbol for the charge density ,
  • the density matrix , a representation of the density operator (for systems in quantum mechanically defined states).
• In chemistry , the small rho is a (non-standard) symbol for the mass concentration .
• In statistics, the small rho is a frequently used symbol for the correlation coefficient.
• In linear algebra and functional analysis , the spectral radius is denoted by a small rho.
• In surveying, the conversion factor between radians and other angular dimensions is denoted with a small rho: ρ = 180 / π for degrees, ρ = 200 / π for gons, ... It is used, for example, in formulas such as α / ρ = b / r, which outside of surveying, the ratio of central angle and arc is usually written as α = b / r.
• In linguistics, the sound change to r is called Rhotazism .
• In queuing theory , it is the degree of utilization .
• In economics , ρ is
  • one of the key figures for evaluating an option and
  • in growth models usually a parameter that reflects the time preference of household consumption.

Character encoding

	Uppercase Ρ	Minuscule ρ	Minuscule ϱ (variant)
LaTeX code	\Rho	\rho	\varrho

Web links

Commons : Rho  - collection of images, videos and audio files

Wiktionary: Rho  - explanations of meanings, word origins, synonyms, translations