during which century did the practice of putting signs on buildings and businesses begin

Answer 1

The practice of putting signs on buildings and businesses has roots that can be traced back to ancient civilizations, but it became more prominent in the late Middle Ages, specifically the 12th century. By this time, as towns and trade grew, it became important for businesses to have identifiable signs to help customers find them. The practice continued to evolve, especially during the Renaissance and into the 17th and 18th centuries, with more elaborate and decorative signs becoming common.