. ▁At ▁the ▁Y ellow stone ▁Convention ▁of ▁ 1 9 3 4 , ▁they ▁voted ▁to ▁limit ▁the ▁links ▁in ▁the ▁bad ge ' s ▁chain ; ▁there ▁are ▁ 1 2 , ▁one ▁for ▁each ▁of ▁the ▁found ers . ▁ ▁The ▁first ▁frat ern ity ▁convention ▁was ▁held ▁in ▁ 1 8 6 8 ▁at ▁the ▁home ▁of ▁F ann ie ▁Thom son ▁in ▁O qu aw ka , ▁Illinois . ▁The ▁frat ern ity ' s ▁second ▁chapter ▁was ▁established ▁that ▁same ▁year ▁at ▁Iowa ▁Wes ley an ▁College ▁in ▁Mount ▁Ple asant , ▁Iowa . ▁The ▁expansion ▁made ▁Pi ▁B eta ▁Ph i ▁the ▁first ▁national ▁( multi - chapter ) ▁women ' s ▁secret ▁society . ▁ ▁Name ▁change ▁and ▁N PC ▁membership ▁ ▁At ▁the ▁ 1 8 8 2 ▁convention , ▁the ▁society ▁officially ▁adopted ▁its ▁mot to ▁as ▁well ▁as ▁the ▁frat ern ity ▁colors ▁of ▁wine ▁and ▁silver ▁blue . ▁It ▁began ▁to ▁use ▁Greek ▁letters ▁as ▁its ▁name ▁six ▁years ▁later ▁in ▁ 1 8 8 8 , ▁when ▁the ▁name ▁was ▁changed ▁from ▁I . ▁C . ▁Sor osis ▁to ▁Pi ▁B eta ▁Ph i . ▁In ▁ 1 8 9 3 , ▁with ▁the ▁number ▁of ▁al um na e ▁members ▁growing , ▁the ▁frat ern ity ▁organized ▁a ▁national ▁al um na e ▁department . ▁Co operation ▁among ▁women ' s ▁frat ern ities ▁and ▁sor or ities ▁was ▁formal ized ▁in ▁ 1 9 0 2 ▁with ▁the