Rho ( / ˈ r oʊ / ; 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 Phoenician letter res . Its uppercase form uses the same glyph , Ρ, as the distinct Latin letter P ; the two letters have different Unicode encodings .
3-524: Rho (Ρ or ρ) is a letter of the Greek alphabet. Rho or RHO also may refer to: Rho Rho is classed as a liquid consonant (together with Lambda and sometimes the nasals Mu and Nu ), which has important implications for morphology . In both Ancient and Modern Greek , it represents an alveolar trill IPA: [r] , alveolar tap IPA: [ɾ] , or alveolar approximant IPA: [ɹ] . In polytonic orthography ,
6-494: A rho at the beginning of a word is written with a rough breathing , equivalent to h ( ῥ rh ), and a double rho within a word is written with a smooth breathing over the first rho and a rough breathing over the second ( ῤῥ rrh ). That apparently reflected an aspirated or voiceless pronunciation in Ancient Greek , which led to the various Greek-derived English words starting with rh or containing rrh . The name of
9-466: The letter is written in Greek as ῥῶ (polytonic) or ρω/ ρο (monotonic). Letters that arose from rho include Roman R and Cyrillic Er (Р). The characters ρ and ϱ are also conventionally used outside the Greek alphabetical context in science and mathematics . The letter rho overlaid with chi forms the Chi Rho symbol, used to represent Jesus Christ . It was first used by Emperor Constantine
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