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Sigma (/ ˈsɪɡmə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation.
Six Sigma (6σ) is a set of techniques and tools for process improvement. It was introduced by American engineer Bill Smith while working at Motorola in 1986. [1][2] Six Sigma strategies seek to improve manufacturing quality by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes.
Sigma Sigma Sigma (ΣΣΣ), also known as Tri Sigma, is a national American women's sorority. Sigma Sigma Sigma is a member of the National Panhellenic Conference (NPC), an umbrella organization encompassing 26 national sororities or women's fraternities, which focus on service, education, scholarship programming and social activities.
Sigma male (or simply sigma) is a term in internet slang used most often to describe the archetype of a male who is a "lone wolf". [ 1 ] [ 2 ] While the name is a product of manosphere message boards in the 2010s, the term has gained widespread prominence within internet culture , and since the early 2020s, has become an internet meme . [ 3 ]
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
Sigma Guitars is a guitar manufacturing brand originally released by C.F. Martin as a line of guitars at affordable prices to compete with the increasing number of imported guitars from Japan and elsewhere. The Sigma line was discontinued by Martin in 2007. The rights to the name were acquired by German company AMI Musical Instruments GmbH ...
In addition, he wrote Sigma's first constitution and was the first president of Alpha Chapter. He was the first person to graduate from Howard University in 3 years with two degrees (A.B and a B.Ed. degree). Charles I. Brown (August 27, 1890 – December 21, 1981), co-founder of Phi Beta Sigma Fraternity; first vice-president of Phi Beta Sigma.
Two Sigma Investments was founded in 2001 by John Overdeck, David Siegel and Mark Pickard. [2] [5] Siegel is a computer science Ph.D. from the Massachusetts Institute of Technology who worked for Tudor Investments, and Overdeck is an International Mathematical Olympiad Silver Medalist who subsequently studied mathematics at Stanford University and worked for Jeff Bezos in Amazon.com's early ...