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Eighteenth letter of the Greek alphabet
Sigma (/ˈsɪɡmə/ SIG-mə; uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. When
Sigma
2024 single by Betsy and Maria Iankovskaia
"Sigma Boy" (Russian: "Сигма Бой") is a song by Russian bloggers and singers Betsy and Maria Iankovskaia, released as a single by the record label Rhymes
Sigma_Boy
Honorary fraternity at the University of Cincinnati, US
Sigma Sigma (ΣΣ) is a men's upperclassmen honorary fraternity at the University of Cincinnati. Founded in 1898, it is the oldest of such organizations
Sigma_Sigma
Topics referred to by the same term
sigma, Sigma, Σ, σ, or ς in Wiktionary, the free dictionary. Sigma (Σ or σ, word-final lowercase ς) is the 18th letter of the Greek alphabet. Sigma may
Sigma_(disambiguation)
North American collegiate sorority
Sigma Sigma Sigma (ΣΣΣ), also known as Tri Sigma, is a national American women's sorority. It was established in 1898 at what is now Longwood University
Sigma_Sigma_Sigma
Probability distribution
{\textstyle \sigma ^{2}} is the variance. The standard deviation of the distribution is the positive value σ {\displaystyle \sigma } (sigma). A random
Normal_distribution
North American collegiate sorority
Phi Sigma Sigma (ΦΣΣ), colloquially known as Phi Sig, was the first collegiate nonsectarian sorority to allow membership of women of all faiths and backgrounds
Phi_Sigma_Sigma
Measure of variation in statistics
represented in mathematical texts and equations by the lowercase Greek letter σ (sigma). In the case of a normal distribution (as typified by the symmetrical bell-shaped
Standard_deviation
Addition of several numbers or other values
also ways to generalize the use of many sigma notations. For example, one writes double summation as two sigma notations with different dummy variables
Summation
American college sorority (1920–1933)
Sigma Sigma Omicron (ΣΣΟ), also known as Sigma Phi Beta (ΣΦΒ), was an American college sorority. It was established at New York University in New York
Sigma_Sigma_Omicron
Matrices important in quantum mechanics and the study of spin
sigma _{j},\sigma _{k}\right]+\{\sigma _{j},\sigma _{k}\}&=(\sigma _{j}\sigma _{k}-\sigma _{k}\sigma _{j})+(\sigma _{j}\sigma _{k}+\sigma _{k}\sigma
Pauli_matrices
American collegiate service sorority
Retrieved 2009-07-23. "Gamma Sigma Sigma - Service". Gamma Sigma Sigma. "Gamma Sigma Sigma - Our Organization". Gamma Sigma Sigma. Benton Harbor News Palladium
Gamma_Sigma_Sigma
American collegiate sorority for South Asians
Sigma Sigma Rho (ΣΣΡ) is a South Asian interest collegiate sorority in the United States. It was established at St. John's University in 1998. It is a
Sigma_Sigma_Rho
Dutch-built family of modular naval vessels, of corvette or frigate size
new SIGMA designs released in early 2015 these are the: SIGMA 8313 SIGMA 8011 SIGMA 7613 SIGMA 6610 They are likely to be part of the Compact SIGMA series
Sigma-class_design
Method for converting signals between digital and analog
Delta–sigma (ΔΣ; or sigma–delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency
Delta-sigma_modulation
American collegiate sorority
Alpha Sigma Alpha (ΑΣΑ) is a United States National Panhellenic sorority founded on November 15, 1901, at the Virginia State Female Normal School (later
Alpha_Sigma_Alpha
British single-seat glider, 1971
The Sigma is an experimental glider developed in Britain from 1966 by a team led by Nicholas Goodhart. After disappointing performance during flight testing
Operation_Sigma_Sigma
The list of Delta Sigma Phi members includes notable people who are or were once a member of the Delta Sigma Phi fraternity. Delta Sigma Phi Hall of Fame
List of Delta Sigma Phi members
List_of_Delta_Sigma_Phi_members
American osteopathic honor fraternity
Sigma Sigma Phi (ΣΣΦ or SSP), is an American osteopathic medicine honors fraternity for medical students training to be Doctors of Osteopathic Medicine
Sigma_Sigma_Phi
Sigma Pi Phi, also known as The Boulé, is an African American professional fraternity. Founded in Philadelphia, Pennsylvania, in 1904, it is the oldest
List_of_Sigma_Pi_Phi_members
Gamma Sigma Sigma is a national service sorority founded by the merger of eight local sororities on October 12, 1952, at Beekman Tower in New York City
List of Gamma Sigma Sigma chapters
List_of_Gamma_Sigma_Sigma_chapters
Shorthand used in statistics
-1\sigma \leq X\leq \mu +1\sigma )&\approx 68.27\%\\\Pr(\mu -2\sigma \leq X\leq \mu +2\sigma )&\approx 95.45\%\\\Pr(\mu -3\sigma \leq X\leq \mu +3\sigma
68–95–99.7_rule
Phi Beta Sigma (ΦΒΣ) is an international historically Black fraternity. Founded on January 9, 1914, on the campus of Howard University in Washington,
List of Phi Beta Sigma chapters
List_of_Phi_Beta_Sigma_chapters
Educational phenomenon of greatly improved performance by tutored learners
Bloom's 2 sigma problem refers to the educational phenomenon that the average student tutored one-to-one using mastery learning techniques performed two
Bloom's_2_sigma_problem
Association football club in Czech Republic
SK Sigma Olomouc is a Czech professional football club based in the city of Olomouc. The club currently competes in the Czech First League, the first
SK_Sigma_Olomouc
Beta Gamma Sigma is an international business honor society. It was founded in 1913 at the University of Wisconsin, University of Illinois and the University
List of Beta Gamma Sigma chapters
List_of_Beta_Gamma_Sigma_chapters
Iota Sigma Pi is an American honor society for women in the sciences, especially chemistry. It was created by the merger of three chemistry honor societies
List_of_Iota_Sigma_Pi_members
Sigma Alpha Epsilon was established at the University of Alabama on March 9, 1856, and has since grown to be an international fraternity. In the following
List of Sigma Alpha Epsilon chapters
List_of_Sigma_Alpha_Epsilon_chapters
Puerto Rican social fraternity
Phi Sigma Alpha (ΦΣΑ), commonly known as La Sigma, is a Puerto Rican fraternity originally established as the Sigma Delta Alpha Fraternity (Sociedad de
Phi_Sigma_Alpha
Drum and bass song from 2016
"Cry" is a song performed by British drum and bass duo Sigma featuring vocals from English pop group Take That (lead vocals by Gary Barlow). The song
Cry_(Sigma_song)
American multicultural collegiate fraternity
Sigma Beta Rho Fraternity, Inc. (ΣΒΡ, also SigRho) is an American collegiate and national multicultural fraternity. Founded in 1996, it was the first
Sigma_Beta_Rho
International historically African American sorority
Delta Sigma Theta Sorority, Inc. (ΔΣΘ) is a historically African American sorority. The organization was founded by college-educated women dedicated to
Delta_Sigma_Theta
Filipino college fraternity
The Upsilon Sigma Phi (ΥΣΦ) is the oldest Greek-letter organization and fraternity in Asia. Founded in 1918, it is also the oldest student organization
Upsilon_Sigma_Phi
African-American fraternity
Sigma Pi Phi (ΣΠΦ), also known as The Boulé, is an African American professional fraternity. Founded in Philadelphia, Pennsylvania, in 1904, it is the
Sigma_Pi_Phi
This list contains the names and schools of all Kappa Sigma chapters and colonies. The fraternity was established at the University of Virginia in 1869
List_of_Kappa_Sigma_chapters
North American collegiate fraternity
Sigma Alpha Epsilon (ΣΑΕ) is a North American Greek-letter social college fraternity. It was founded at the University of Alabama in Tuscaloosa, Alabama
Sigma_Alpha_Epsilon
Japanese camera and camera lens manufacturer
Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma) is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories
Sigma_Corporation
Sigma Alpha Epsilon is a North American social college fraternity. It was founded at the University of Alabama in Tuscaloosa, Alabama, on March 9, 1856
List of Sigma Alpha Epsilon members
List_of_Sigma_Alpha_Epsilon_members
Methodology of systematically removing waste
Lean Six Sigma is a process improvement method that uses a collaborative team effort to improve performance by systematically removing operational waste
Lean_Six_Sigma
Probability distribution
{\ln x-\mu }{\sigma }}\right)}{\frac {1}{\sigma x}}\\[6pt]&={\frac {1}{x\sigma {\sqrt {2\pi }}}}\exp \left(-{\frac {(\ln x-\mu )^{2}}{2\sigma ^{2}}}\right)~
Log-normal_distribution
Foundational principle in quantum physics
that year and by Hermann Weyl in 1928: σ x σ p ≥ ℏ 2 {\displaystyle \sigma _{x}\sigma _{p}\geq {\frac {\hbar }{2}}} where ℏ = h 2 π {\displaystyle \hbar
Uncertainty_principle
Sigma Sigma Phi is an American osteopathic medicine honors fraternity for students training to be Doctors of Osteopathic Medicine. It was founded in 1921
List of Sigma Sigma Phi chapters
List_of_Sigma_Sigma_Phi_chapters
Sigma Gamma Rho is an international historically African American sorority that was founded in 1922 in Indianapolis, Indiana. In the following list of
List of Sigma Gamma Rho chapters
List_of_Sigma_Gamma_Rho_chapters
Action-adventure game
Ninja Gaiden Sigma, with graphical improvement and gameplay changes; this was released on the portable PlayStation Vita as Ninja Gaiden Sigma Plus. Ninja
Ninja Gaiden (2004 video game)
Ninja_Gaiden_(2004_video_game)
American Latina-oriented collegiate sorority
Sigma Iota Alpha, more formally Hermandad de Sigma Iota Alpha, Incorporada (ΣΙΑ), and known as SIA, is a Latina-oriented Greek letter intercollegiate sorority
Sigma_Iota_Alpha
Gamma Sigma Delta is a co-ed honor society for students of agriculture and the related sciences. Its first six chapters began as Delta Theta Sigma. Where
List of Gamma Sigma Delta chapters
List_of_Gamma_Sigma_Delta_chapters
2009 video game for PlayStation 3
Ninja Gaiden Sigma 2, stylized as Ninja Gaiden Σ2, is a 2009 action-adventure game developed by Team Ninja and published by Tecmo Koei for the PlayStation
Ninja_Gaiden_Sigma_2
International historically Black American collegiate fraternity
Phi Beta Sigma Fraternity, Inc. (ΦΒΣ) is a historically African American fraternity. It was founded at Howard University in Washington, D.C. in 1914.
Phi_Beta_Sigma
North American collegiate secret society and fraternity
Phi Kappa Sigma (ΦΚΣ), also known as Phi Kap, Skulls, Skullhouse, or PKS, is an international all-male college secret society and social fraternity. Commonly
Phi_Kappa_Sigma
American pedagogical sorority
Pi Kappa Sigma (ΠΚΣ or Pi Kap) was an American national collegiate sorority. Established in 1894 at the Michigan State Normal School, it was the first
Pi_Kappa_Sigma
Beta Phi Mu. Merged with Delta Zeta. Merged with Beta Sigma Omicron. Merged with Sigma Sigma Sigma. Originally a Jewish sorority. Merged with Phi Omega
List of social sororities and women's fraternities
List_of_social_sororities_and_women's_fraternities
Upsilon Phi Sigma is an inter-university and collegiate fraternity and sorority that was established at the University of the Philippines Los Baños on
List of Upsilon Phi Sigma chapters
List_of_Upsilon_Phi_Sigma_chapters
Mathematical version of an order change
σ ( 6 ) = 1 {\displaystyle \sigma (1)=2,\ \ \sigma (2)=6,\ \ \sigma (3)=5,\ \ \sigma (4)=4,\ \ \sigma (5)=3,\ \ \sigma (6)=1} can be written as σ = (
Permutation
Algebraic structure of set algebra
In mathematical analysis and in probability theory, a σ-algebra ("sigma algebra") is part of the formalism for defining sets that can be measured. In
Σ-algebra
Delta Sigma Theta (ΔΣΘ) is a historically African American sorority that was founded at Howard University in 1913. Historically, the sorority had collegiate
List of Delta Sigma Theta alumnae chapters
List_of_Delta_Sigma_Theta_alumnae_chapters
Business process improvement technique
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
Six_Sigma
Theta Sigma Phi was an American honor society for women in journalism. It was established in 1909 at the University of Washington in Seattle, Washington
List of Theta Sigma Phi chapters
List_of_Theta_Sigma_Phi_chapters
Slang terms for men
have expanded the Greek-letter hierarchy to include related terms such as "sigma male," used to describe a solitary but high-status "lone wolf" who exists
Alpha_and_beta_male
Sigma Gamma Rho is a historically African American sorority that was founded in 1922 at Butler University. Below is a list of some of the notable members
List of Sigma Gamma Rho members
List_of_Sigma_Gamma_Rho_members
Co-educational service sorority
Tau Beta Sigma Honorary Band Sorority (ΤΒΣ, colloquially referred to as TBSigma or TBS) is a co-educational recognition and service sorority for collegiate
Tau_Beta_Sigma
Class of mathematical sets
{\displaystyle T} T δ σ = ( T δ ) σ . {\displaystyle T_{\delta \sigma }=(T_{\delta })_{\sigma }.} Now define by transfinite induction a sequence G m {\displaystyle
Borel_set
Camera model
The Sigma SD1 is a digital SLR camera produced by the Sigma Corporation of Japan. The camera uses a Foveon X3 sensor, which comprises 3 layers of 4800
Sigma_SD1
Matrix decomposition
the form M = U Σ V ∗ {\displaystyle \mathbf {M} =\mathbf {U} \mathbf {\Sigma } \mathbf {V} ^{*}} , where U {\displaystyle \mathbf {U} } is an
Singular_value_decomposition
War games played in the Pentagon in the 1960s
The Sigma war games were a series of classified high level war games played in the Pentagon during the 1960s to strategize the conduct of the burgeoning
Sigma_war_games
Sigma Kappa is a sorority founded in1874 at Colby College in Waterville, Maine. In 1959, Sigma Kappa and Pi Kappa Sigma merged, which created many of
List_of_Sigma_Kappa_chapters
Phi Beta Sigma is a historically African American fraternity that was founded at Howard University in Washington, D.C. in 1914. The fraternity's membership
List of Phi Beta Sigma members
List_of_Phi_Beta_Sigma_members
Student honor society
Sigma Tau Delta (ΣΤΔ) is a US-based, international honor society for students of English at four-year colleges and universities who are within the top
Sigma_Tau_Delta
United States historic place
The Sigma Sigma–Delta Chi Fraternity House, also known as the Iowa House, is a historic building in Ames, Iowa, United States. It is located at 405 Hayward
Sigma Sigma–Delta Chi Fraternity House
Sigma_Sigma–Delta_Chi_Fraternity_House
American college fraternity (1921–2020)
Sigma Mu Sigma (ΣΜΣ) is a former American college fraternity founded in 1921 at Trine University, formerly Tri-State University. Sigma Mu Sigma was historically
Sigma_Mu_Sigma
American honor society
National Honor Society is also known by its Greek designation Omicron Sigma Sigma (ΟΣΣ). Its colors are gold and blue. Its motto in Latin is Ex scientia
Order_of_the_Sword_&_Shield
chapter at Saint Mary's School became a chapter of Alpha Sigma Alpha in. 1909. Gamma Beta Sigma's insignia included a skull and crossed bones, a skeleton
Defunct North American collegiate sororities
Defunct_North_American_collegiate_sororities
Sigma Chi is a North American collegiate fraternity. It was established in 1855 at Miami University in Oxford, Ohio, by members who split from the Delta
List_of_Sigma_Chi_chapters
The Upsilon Sigma Phi (ΥΣΦ) is the oldest Greek-letter organization and fraternity in Asia. It is the first student organization in the University of
List of Upsilon Sigma Phi members
List_of_Upsilon_Sigma_Phi_members
Beta Sigma Phi is an international noncollegiate sorority. It was established on April 30, 1931, in Abilene, Kansas. By 1975, it had established more
List of Beta Sigma Phi chapters
List_of_Beta_Sigma_Phi_chapters
Photographic fisheye lens by Sigma Corporation
The Sigma 8mm f/4 EX DG is a photographic lens made by the Sigma Corporation. It is a circular fisheye lens for full-frame cameras, and has been replaced
Sigma_8mm_f/4_EX_DG_lens
Historically African American sorority
Sigma Gamma Rho Sorority, Inc. (ΣГΡ), is a historically African-American sorority that was established in Indianapolis, IN on Nov. 12, 1922. Seven African-American
Sigma_Gamma_Rho
Municipality in Capiz, Philippines
Sigma, officially the Municipality of Sigma (Capiznon/Hiligaynon: Banwa sang Sigma; Tagalog: Bayan ng Sigma), is a municipality in the province of Capiz
Sigma,_Capiz
Topics referred to by the same term
mathematics, by sigma function one can mean one of the following: The sum-of-divisors function σa(n), an arithmetic function Weierstrass sigma function, related
Sigma_function
Topics referred to by the same term
Sigma constant (σ constant) may refer to: Yamabe invariant, in mathematics A parameter of the Hammett equation in organic chemistry The constant of proportionality
Sigma_constant
Iota Sigma Pi an American honor society for women in the sciences, especially chemistry. It was created by the merger of three chemistry honor societies
List of Iota Sigma Pi chapters
List_of_Iota_Sigma_Pi_chapters
Index of articles associated with the same name
The Bayer designation σ Gruis (Sigma Gruis) refers to 2 distinct star systems in the constellation Grus: σ1 Gruis σ2 Gruis This set index article includes
Sigma_Gruis
1933 film directed by Edwin L. Marin
The Sweetheart of Sigma Chi is a 1933 American pre-Code comedy film directed by Edwin L. Marin and written by Luther Reed and Albert DeMond. The film
The Sweetheart of Sigma Chi (film)
The_Sweetheart_of_Sigma_Chi_(film)
Lens for photographic camera
The Sigma 50mm f/1.4 EX DG HSM is a normal prime lens made by the Sigma Corporation. The lens is produced in Canon EF mount, Four Thirds System, Nikon
Sigma 50mm f/1.4 EX DG HSM lens
Sigma_50mm_f/1.4_EX_DG_HSM_lens
North American collegiate fraternity
Phi Sigma Kappa (ΦΣΚ), colloquially known as Phi Sig or PSK, is a men's social and academic fraternity with approximately 74 active chapters and provisional
Phi_Sigma_Kappa
This is a list of notable organizations that provide Six Sigma certification. American Society for Quality (ASQ) Chartered Quality Institute (CQI) Institute
List of Six Sigma certification organizations
List_of_Six_Sigma_certification_organizations
Topics referred to by the same term
Sigma 7 may refer to: the callsign of the spacecraft used in the 1962 Mercury-Atlas 8 mission the SDS Sigma 7 computer, made by Scientific Data Systems
Sigma_7
Mega Man X character
Sigma (Japanese: シグマ, Hepburn: Shiguma) is a fictional character and the main antagonist of the Mega Man X video game series. Created by Dr. Cain, Sigma
Sigma_(Mega_Man_X)
Sigma Sigma Sigma sorority has 98 active chapters. Following is a list of Sigma Sigma Sigma chapters. Active chapters noted in bold, inactive chapters
List of Sigma Sigma Sigma chapters
List_of_Sigma_Sigma_Sigma_chapters
American collegiate fraternity
Sigma Alpha Mu (ΣΑΜ), commonly known as Sammy, is a college fraternity founded at the City College of New York in 1909. The fraternity was originally
Sigma_Alpha_Mu
North American collegiate fraternity
Sigma Chi (ΣΧ) is one of the largest North American social fraternities. The fraternity has 244 active undergraduate chapters and 152 alumni chapters
Sigma_Chi
Photographic lens
Sigma 24-35mm F2 DG HSM Art is an interchangeable camera lens announced by Sigma Corporation on June 19, 2015. http://www.dpreview.com/products/sigma
Sigma_24-35mm_F2_DG_HSM_Art
Sigma Pi Phi is an African American professional fraternity. Founded in Philadelphia, Pennsylvania, in 1904, it is the oldest Greek lettered fraternity
List_of_Sigma_Pi_Phi_chapters
North American collegiate fraternity
Sigma Tau Gamma (ΣΤΓ), commonly known as Sig Tau, is a United States college social fraternity founded on June 28, 1920, at the University of Central
Sigma_Tau_Gamma
Mechanism of electrical conduction in disordered materials
σ 0 e − ( T 0 / T ) β {\displaystyle \sigma =\sigma _{0}e^{-(T_{0}/T)^{\beta }}} where σ {\displaystyle \sigma } is the conductivity and β {\displaystyle
Variable-range_hopping
Photographic lens
The Sigma 105mm f/2.8 EX DG is a macro lens produced by Sigma Corporation. The lens has six different variates, fitting on the Sigma SA mount, Canon EF
Sigma_105mm_f/2.8_EX_DG_lens
Semi-automatic pistol
American company Smith & Wesson introduced in 2010, replacing the SW / Sigma line. Smith & Wesson started manufacturing "SD VE" (VE for Value Enhanced)
Smith_&_Wesson_SD_VE
Sigma Phi Epsilon is an American social college fraternity. It was founded on November 1, 1901, at Richmond College, which is now the University of Richmond
List of Sigma Phi Epsilon chapters
List_of_Sigma_Phi_Epsilon_chapters
Czech footballer (born 2003)
club Sigma Olomouc and progressed through the club's youth system. In April 2018, he played in the Vlastislav Mareček’s memorial tournament for Sigma Olomouc
Radek_Vítek
International music fraternity for women
Sigma Alpha Iota (ΣΑΙ) is an international music fraternity. It was established in 1903 at the University School of Music in Ann Arbor, Michigan. Sigma
Sigma_Alpha_Iota
2002 Brazilian school shooting
On 28 October 2002, a school shooting occurred at the Sigma School (Portuguese: Escola Sigma) in Salvador, capital of Bahia, Brazil. The perpetrator, a
Sigma_School_shooting
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