Three central cities of Medieval Rhineland Jewry were: Speyer, Worms, and Mainz. The initials of the Hebrew names for these cities, Shpira, Vermayza, and Magentza form the initials שו"ם (SHUM) . >>> The Jewish Traveler Mainz, Worms & Speyer>># Worms >># Mainz >># Speyer >>>>>>>>=The Takkanot Shum תקנות שו"ם The Takkanot Shum תקנות שו"ם , or Enactments of SHU"M were a set of decrees formulated ...