Which ancient symbol, depicting a distinctive fish, was used by early Christians as a secret 'brand mark' to identify safe meeting places during Roman persecution?

Before modern logos and brand identities, ancient civilizations used powerful symbols to represent their cultures, leaders, and products. These symbols were carefully designed to convey authority, divine connection, or quality of goods in marketplaces across the ancient world. Test your knowledge about these early 'brand identities' that influenced trade and commerce thousands of years ago!

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Ichthys (Jesus fish)
Ankh (Egyptian symbol of life)
Labrys (double-headed axe)
Ouroboros (serpent eating its tail)