In ancient Rome, what distinctive retail marketing practice did shopkeepers use to brand their businesses when literacy rates were low?

The ancient world had sophisticated retail systems long before modern commerce. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, ancient civilizations developed innovative retail experiences and marketing strategies. This trivia question challenges your knowledge about how these early societies approached product branding and retail environments that still influence commerce today.

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Carved pictorial signs showing their products (like a wheat sheaf for bakeries or wine jug for taverns)
Hired professional singers to compose and perform songs about their products
Distributed clay tokens stamped with their store's name to be used as loyalty currency
Released trained birds painted in store colors to fly around the neighborhood