Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Letters | Organization | Nickname | Founding Date | Founding University | Type |
| --- | --- | --- | --- | --- | --- |
| αΚΔΦ | alpha Kappa Delta Phi 1 | "KDPhi" | 1990-02-07 | University of California, Berkeley | Sorority |
| ΑΦΓ | Alpha Phi Gamma 1 | "APhiG" | 1994-02-01 | California State Polytechnic University, Pomona | Sorority |
| ΑΨΡ | Alpha Psi Rho | "APsiRho" or "Rho Doggs" | 2000-03-01 | San Diego State University | Fraternity |
| ΑΣΛ | Alpha Sigma Lambda | "Alpha Sigs" | 1993-10-15 | California State Polytechnic University, Pomona | Fraternity |
| ΑΣΡ | Alpha Sigma Rho | "Alphas", "ASR" or "Alpha Sigs" | 1998-04-02 | University of Georgia | Sorority |
| ΒΠΦ | Beta Pi Phi | "Betas" or "Betafish" | 2005-12-15 | Temple University | Fraternity |
| ΒΥΔ | Beta Upsilon Delta | "Buds" | 1998-8-21 | University of California, Riverside | Fraternity |
| ΒΩΦ | Beta Omega Phi | "Betas" | 1965-00-00 | California State University, Los Angeles | Fraternity |
| ΓΒ | Gamma Beta | "GBs" | 2000-05-01 | University of Texas at Austin | Fraternity |
| ΓΕΩ | Gamma Epsilon Omega | "Gammas" | 1963-00-00 | University of Southern California | Fraternity |
| ΔΧΨ | Delta Chi Psi | "Deltas" or "DXPsi" | 2004-12-18 | Temple University | Fraternity |
| ΔΛΧ | Delta Lambda Chi | "DLC" | 2002-02-09 | University of California, Irvine | Sorority |
| ΔΦΚ | Delta Phi Kappa | "Deltas" | 1960-05-06 | University of Southern California | Sorority |
| ΔΦΛ | Delta Phi Lambda 1 | "DPhiL" | 1998-12-05 | University of Georgia | Sorority |
| ΖΦΡ | Zeta Phi Rho | "Zetas" | 1995-08-10 | California State University, Long Beach | Fraternity |
| ΘΔΒ | Theta Delta Beta | "Thetas" or "The Dark Boyz" | 1990-00-00 | University of California, Irvine | Fraternity |
| ΘΚΦ | Theta Kappa Phi | "Thetas" | 1959-00-00 | University of California, Los Angeles | Sorority |
| ΚΖΦ | Kappa Zeta Phi | "Kappas" | 1960-12-00 | California State University, Los Angeles | Sorority |
| ΚΦΛ | Kappa Phi Lambda 1 | "Kappas" or "KPL" | 1995-03-09 | SUNY Binghamton | Sorority |
| ΚΠΒ | Kappa Pi Beta | "KPiB" | 2000-03-16 | Northern Illinois University | Fraternity |
| ΚΓΔ | Kappa Gamma Delta | "KGD" | 1997-04-17 | Indiana University Bloomington | Sorority |
| ΛΦΕ | Lambda Phi Epsilon 1 2 | "Lambdas" or "LPhiE" | 1981-02-25 | University of California, Los Angeles | Fraternity |
| ΛΘΔ | Lambda Theta Delta | "LTD" | 1983-03-02 | University of California, Irvine | Fraternity |
| ΝΑΦ | Nu Alpha Phi | "Nappies" | 1994-03-18 | State University of New York at Albany | Fraternity |
| ΞΚ | Xi Kappa | "XK" | 1998-02-28 | University of Georgia | Fraternity |
| ΦΔΣ | Phi Delta Sigma | "Phi Sig or FDS" | 2007-08-07 | University of Maryland, College Park | Fraternity |
| ΠΑΦ | Pi Alpha Phi 1 | "P.A.Phi's or Pineapples" | 1929-02-01 | University of California, Berkeley | Fraternity |
| ΠΔΨ | Pi Delta Psi 1 | "PDPsi" | 1994-02-20 | State University of New York at Binghamton | Fraternity |
| ΡΨ | Rho Psi | "Su Yu She" | 1916-00-00 | Cornell University | Fraternity |
| ΡΔΧ | Rho Delta Chi | "Rhos" | 1991-01-17 | University of California, Riverside | Sorority |
| ΣΟΠ | Sigma Omicron Pi 1 | "S.O.Pi" | 1930-00-00 | San Francisco State University | Sorority |
| ΣΦΩ | Sigma Phi Omega | "Sigmas" | 1949-00-00 | University of Southern California | Sorority |
| ΣΨΖ | Sigma Psi Zeta 1 | "SYZ" or "Sigmas" | 1994-03-23 | University at Albany | Sorority |
| ΧΑΔ | Chi Alpha Delta | "Chis" | 1928-00-00 | University of California, Los Angeles | Sorority |
| ΧΔΘ | Chi Delta Theta | "Chi Delts" | 1989-10-13 | University of California, Santa Barbara | Sorority |
| ΧΣΤ | Chi Sigma Tau 1 | "Chi Sigs" or "CST" | 1999-09-09 | University of Illinois at Chicago | Fraternity |
| ΨΧΩ | Psi Chi Omega | "Psi Chi's" | 1992-01-24 | University of California, San Diego | Fraternity |
| ΩΦΓ | Omega Phi Gamma | "Omegas" | 1995-05-21 | University of Texas at Austin | Fraternity |
Question:
name the sorority a.k.a. "sigmas" that was founded in the university of southern california.
Answer:
Sigma Phi Omega