[marquise1911]

Originally posted by Nupeology

Phi Beta Sigma & Zeta Phi Beta were the first and only
constitutionally bonded Greek Fraternity/Sorority, brother/sister
organizations. They share several of the same cardinal
principles within each respective organization.
Sigma & Zeta both share the same colors, creed, symbols from
their shields, and the namesake of the PHI BETA, they are true
originators of the terms "Frat" & "Soror".

Not true, there are several white fraternities/sororities that were constitutionally bound way before PBS and ZPB were founded. And actually the term frat and soror were commonly used before that. They are just shortened versions of frater and sis-soror, which are interfraternal/intersorority greetings.