The motto of Pi Mu Honor Society is 'Semper Ad Honorem'.
Pi Mu Honor Society was created on 1892-12-13.
Mu Phi Epsilon's motto is 'Seeketh not its own'.
Pi Mu Epsilon was created in 1914.
Omicron Epsilon Pi's motto is 'Not for ourselves, but for all in diversity'.
Pi Gamma Mu was created on 1924-12-01.
No. Pi Gamma Mu is a small group of about 120 third-rate colleges and universities. Pi Gamma Mu has no top university or college chapters, has very low admission criteria, particularly in a period of grade inflation (e.g., B average, belonging to the first 35% of the graduating class, etc.), and it defines practically every non-science field as a social science to get as many members as possible. Pi Gamma Mu also begs so many college/university faculty to put up chapters in their respective schools because very few are aware of, or interested in, this group. See, for example, this link I found, which is contained below, is a more recent Pi Gamma Mu press release begging for chapters: Pi Gamma Mu also claims to be "international" simply because it has two chapters in two Third World countries (Kuwait and the Philippines). Finally, Pi Gamma Mu has become redundant because there are already discipline-specific honor societies for any outstanding students in each of the social sciences.(e.g., Pi Sigma Alpha honor society in political science, Alpha Kappa Delta in sociology, Psi Chi in psychology, Alpha Phi Sigma in criminology, Lambda Alpha in anthropology, Omicron Delta Epsilon in economics, Sigma Iota Rho in international relations, Phi Alpha Theta in history, etc.). In fact, it is more difficult to gather different social science majors under one, so-called general social science honor society, like Pi Gamma Mu, which is why we have this proliferation of discipline-specific honor societies in the social sciences as noted above.
Omega Pi's motto is 'Eureka'.
The motto of Xi Alpha Pi is 'In brotherhood we sacrifice.'.
The motto of Alfa Kappa Pi is 'Health Science and Charity'.
Pi Lambda Chi's motto is 'Preserving Latina Culture'.
Alpha Epsilon Pi's motto is 'font-size:83%'.
Pi Alpha Phi's motto is 'A Tradition of Excellence Since 1929'.