I culled some info from older editions of the To Better The Man (the pledge manual of Alpha Sigma Phi) which can still be accessed at our chapter's old website at
www.ou.edu/student/greek/alpha-sigma-phi . (Sadly, Alpha Alpha chapter went inactive in the fall of 2000.)
As you may remember, portions of the ritual and symbolism of Alpha Kappa Pi were incorporated into our pledging ceremony, and the Sister Pin is essentially the badge of old Alpha Kappa Pi with the letters Alpha Sigma Phi instead. Unlike the mergers with Phi Pi Phi and Alpha Gamma Upsilon, AKPi's was a consolidation, with significant changes to the government and ritual of Alpha Sigma Phi.
What chapter are you from, Brother?