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Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.
Many symbols have traditional uses, such as lower case epsilon (ε) for an arbitrarily small positive number, lower case pi (π) for the ratio of the circumference of a circle to its diameter, capital sigma (Σ) for summation, and lower case sigma (σ) for standard deviation.
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 .
Epsilon with acute and smooth breathing: Archaic letter denoting the absence of /h/ prior to the vowel, with a high pitch on a short vowel or rising pitch on a long vowel Ἒἒ: Epsilon with grave and smooth breathing: Archaic letter denoting the absence of /h/ prior to the vowel, with a normal or low pitch Ἑἑ: Epsilon with rough breathing
Sigma Delta: 1938 – 1961: Lake Forest College [co] Lake Forest: Illinois: Inactive [cp] Rho Delta: 1939 – 1996: University of Texas at El Paso: El Paso: Texas: Inactive [cq] Pi Delta: 1939: New Mexico State University: Las Cruces: New Mexico: Active [cr] Phi : 1940 – 1996: University of Southern California: Los Angeles: California ...
Epsilon Rho: 1969 Purdue University: West Lafayette: Indiana Active Gamma Phi (Second) October 24, 1970 – xxxx ? Miles College: Fairfield: Alabama Inactive, Reissued [24] Epsilon Sigma: 1970 Texas A&M University–Commerce: Commerce: Texas Active Epsilon Tau: 1970 Xavier University of Louisiana: New Orleans: Louisiana Active Epsilon Upsilon: 1970
Epsilon Rho: 1961–1990, 2018 ... Epsilon Sigma: 1961 Wagner College: Staten Island, New York: Active Epsilon Tau: 1961–2001, 2009 Stephen F. Austin State University:
Epsilon Rho: 1963 Lamar University: Beaumont: Texas: Active 326 Epsilon Sigma: January 18, 1964: University of Texas at San Antonio and St. Mary's University, Texas: San Antonio: Texas: Active 327 Epsilon Tau: May 13, 1964: University of Wisconsin–Milwaukee: Milwaukee: Wisconsin: Active 328 Epsilon Upsilon: May 22, 1964: Southern University ...