[The_Nash]

Sigma Pi's single letter chapters in order of founding date
Alpha- Vincennes University
Phi- Univ of Illinois
Gamma- Ohio State Univ
Kappa- Temple
Delta-Univ. of Pennsylvania
Epsilon- Ohio University
Zeta- Ohio Northern University
Eta- Purdue
Theta- Penn State
Iota- University Of California Berkeley
Lambda- Kenyon College
Mu- Cornell
Nu- Franklin and Marshall College
Xi- University of Iowa
Omicron- Tulane
Pi- University of Utah Salt Lake City
Rho- North Carolina State University
Sigma- Iowa State Universtiy
Tau-University of Wisconson Madison
Upsilon- UCLA
Chi-University of Pittsburgh
Psi- Emory University
Omega- Oregon State University
Beta- Indiana University

16 of these chapters are active, with 2 of them being recently colonized, including University of Wisconsin Madison after being closed since 1932.