In ancient Pompeii, what unique traditional advertising technique was commonly used to help illiterate customers identify specific shops and businesses?

Throughout history, diverse cultures have developed unique traditional advertising methods that reflect their heritage, values, and social structures. Before digital marketing and mass media, communities around the world used fascinating techniques to promote products and services - from town criers to symbolic imagery on storefronts. This trivia question explores how one particular ancient culture innovatively advertised commercial establishments in their bustling urban centers.

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Mosaic symbols and pictographs outside shops (e.g., a goat for a dairy, amphorae for wine shops)
Designated town criers who sang songs about each business's offerings every morning
Color-coded fabric banners that followed a universal commercial code system
Scent markers using different incense blends to indicate shop types from a distance