Reb (//, Yiddish: רב) is a Yiddish honorific traditionally used for Orthodox Jewish men. It is not a rabbinic title; it is the equivalent of the English "mister". In writing it is abbreviated as ר׳. It may also be a short form of Rebbe.
When addressing someone directly, Reb is usually used with the first name only ("May I help you, Reb Chaim?"). In other circumstances, it can be used with either the first name or the full name ("This is Reb Chaim Jacobs."; "Would you please help Reb Chaim?"). In formal written address, it is usually used along with the full name.
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