Reb (Yiddish: רב, /ˈrɛb/) is a Yiddish or Hebrew honorific traditionally used for Orthodox Jewish men. It is not a rabbinic title.[1] In writing it is abbreviated as ר׳. On a gravestone, ב’ר is an abbreviation for ben/bat reb meaning “son/daughter of the worthy…”[1] Reb may also be a short form of Rebbe. It is generally only used for married men, sometimes an equivalent of “Mr.”
A never-married man[2] is referred to as Habachur.[3][4]