Information about Rho (letter)
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- For other uses, see Rho.
Rho (uppercase Ρ, lowercase ρ or ϱ) is the 17th letter of the Greek alphabet. In the system of Greek numerals it has a value of 100. It is derived from Semitic Rêš "head" (see Resh).
Rho is generally classed as a liquid (together with lambda and sometimes the nasals mu and nu), which has important implications for morphology. It is pronounced similarly to the letter r in languages with a Latin-derived alphabet. In polytonic orthography a rho at the beginning of a word is conventionally written with a rough breathing (equivalent to h) — ῥ — 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 — apparently reflecting an aspirated or voiceless pronunciation in Ancient Greek, hence the various Greek-derived English words which start with rh or contain rrh. The name of the letter is written in Greek as ῥῶ (polytonic) or ρώ (monotonic).
Letters that arose from rho include Roman R and Cyrillic Er (Р).
Common notational uses
- lower-case rho ρ
It is commonly used in physics to represent density (lower-case) and resistivity (lower-case), in mathematics to represent the radius in a system of spherical polar coordinates, in economics to represent the discount rate of future pence cash flows and in molecular biology to represent the Rho protein responsible for termination of RNA synthesis. In such occasions, it is often represented as ϱ ("rho symbol" U+03F1), to avoid confusion with the Latin letter p.
In LaTeX, the symbols are
\Rho (
), \rho (
), and \varrho ().
It is used in statistics to represent the correlation coefficient of a population parameter.
In an issue of Mad Magazine in the 1960s, there was an article satirizing college fraternities, and the fictitious fraternity in it was named "Rho Rho Rho," using an actual Greek letter but also being a play on words--"Row, Row, Row Your Boat." The fraternity, also called P P P or "Tri Rho," was described as thoroughly disreputable. Its emblem was a sword with a wide blade, which appeared on all the fraternity's products. These included a military-style blanket, "Officially sanctioned." (The caption was quick to add, "Officially sanctioned by the fraternity of course; not by any of the military services)."
Greek alphabet
Child systems Gothic
Glagolitic
Cyrillic
Coptic
Old Italic alphabet
Latin alphabet
ISO 15924 Grek
Note: This page may contain IPA phonetic symbols in Unicode.
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Child systems Gothic
Glagolitic
Cyrillic
Coptic
Old Italic alphabet
Latin alphabet
ISO 15924 Grek
Note: This page may contain IPA phonetic symbols in Unicode.
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Alpha (Greek ἄλφα), (uppercase Α, lowercase α) is the first letter of the Greek alphabet. In the system of Greek numerals it has a value of 1. It was derived from the Phoenician letter Aleph .
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Nu (uppercase Ν, lowercase ν) is the 13th letter of the Greek alphabet. In the system of Greek numerals it has a value of 50. Its Latin Alphabet equivalent is N.
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Beta (uppercase Β, lowercase β and internal ϐ) is the second letter of the Greek alphabet. In the system of Greek numerals it has a value of 2. It was derived from the Phoenician letter Beth .
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Xi (uppercase Ξ, lowercase ξ) is the 14th letter of the Greek alphabet. It is pronounced [zaɪ] by US English speakers, but [ksi]
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Gamma (uppercase Γ, lowercase γ) is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3. It was derived from the Phoenician letter Gimel .
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Omicron (uppercase Ο, lowercase ο, literally "small o": o mikron, micron meaning 'small' in contrast to omega) is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70.
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Delta (uppercase Δ, lowercase δ) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter Dalet .
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Pi (uppercase Π, lower case π) is the sixteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 80.
In Modern Greek, the name of the letter is pronounced /pi/
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In Modern Greek, the name of the letter is pronounced /pi/
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Epsilon (uppercase Ε, lowercase ε) is the fifth letter of the Greek alphabet, corresponding phonetically to a close-mid front unrounded vowel /e/. In the system of Greek numerals it has a value of 5. It was derived from the Phoenician letter He .
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Zeta (uppercase Ζ, lowercase ζ) is the sixth letter of the Greek alphabet. In the system of Greek numerals it has a value of 7. It was derived from the Phoenician letter Zayin . Letters that arose from Zeta include the Roman Z and Cyrillic З (Ze).
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Sigma (upper case Σ, lower case σ, lower case in word-final position ς) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 200.
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Eta (uppercase Η, lowercase η) is the seventh letter of the Greek alphabet. In the system of Greek numerals it has a value of 8. It was derived from the Phoenician letter Heth . Letters that arose from Eta include the Latin H and the Cyrillic letter И.
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Tau (uppercase Τ, lowercase τ) is the 19th letter of the Greek alphabet. In the system of Greek numerals it has a value of 300. This letter in English is pronounced taʊ
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Theta (uppercase Θ, lowercase θ or ϑ) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth. In the system of Greek numerals it has a value of 9.
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Upsilon (uppercase Υ, lowercase υ) is the 20th letter of the Greek alphabet. In the system of Greek numerals it has a value of 400. It is derived from the Phoenician waw.
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Phi (uppercase Φ, lowercase φ or ϕ), pronounced [fi] in modern Greek and as [faɪ] in English, is the 21st letter of the Greek alphabet.
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Kappa (uppercase Κ, lowercase κ or ϰ) is the 10th letter of the Greek alphabet, used to represent the voiceless velar stop, or "k", sound in Ancient and Modern Greek.
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Chi (uppercase Χ, lowercase χ) is the 22nd letter of the Greek alphabet. Its value in Ancient Greek was an aspirated velar stop /kʰ/ (in the Western Greek alphabet: /ks/).
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Lambda (uppercase Λ, lowercase λ) is the 11th letter of the Greek alphabet. In the system of Greek numerals it has a value of 30. Letters that arose from Lambda include the Roman L and the Cyrillic letter El (Л, л).
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Psi (uppercase Ψ, lowercase ψ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (like in English "lapse").
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Mu (uppercase Μ, lowercase μ) is the 12th letter of the Greek alphabet. In the system of Greek numerals it has a value of 40. Mu was derived from the Egyptian hieroglyphic symbol for water () which had been simplified by the Phoenicians and named after their
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OMEGA is the premier counter-terrorism unit of Latvia.
Founded in 1992, OMEGA cooperates with many other counter-terrorism units over the world. Its equipment and weaponry includes the Heckler & Koch MP5, the Steyr AUG and the Makarov PM.
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Founded in 1992, OMEGA cooperates with many other counter-terrorism units over the world. Its equipment and weaponry includes the Heckler & Koch MP5, the Steyr AUG and the Makarov PM.
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Digamma (uppercase Ϝ, lowercase ϝ) is an archaic letter of the Greek alphabet, used primarily as a Greek numeral.
The letter had the phonetic value of a voiced labial-velar approximant /w/.
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The letter had the phonetic value of a voiced labial-velar approximant /w/.
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Qoppa or Koppa (uppercase Ϙ, lowercase ϙ) is a letter that was used in early forms of the Greek alphabet, derived from Phoenician qoph.
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Stigma (uppercase Ϛ, lowercase ϛ) is a ligature of the Greek letters sigma and tau, sometimes used nowadays to represent the Greek numeral 6. It is encoded in Unicode as "Greek letter stigma" U+03DA (Ϛ
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Sampi (uppercase Ϡ, lowercase ϡ) is an obsolete letter of the Greek alphabet and has a numeric value of 900 when used as a mathematical character. It may have been derived from the older letter san.
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San (uppercase Ϻ, lowercase ϻ) was a letter of the Greek alphabet, appearing between Pi and Qoppa in alphabetical order, corresponding in position to the Phoenician Tsade , but its name comes from Shin.
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Sho (majuscule Ϸ, minuscule ϸ) was a letter added to the Greek alphabet in order to write the Bactrian language[1].
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