3. The bronze mirror with four symbols:

File photo of a bronze mirror with four symbols from the National Museum of China's collection. [Photo/Provdided to China Daily]

The Sui Dynasty mirror measures 18 centimeters in diameter and features 12 zodiac carvings around four symbols: the azure dragon, the vermilion bird, the white tiger and the black tortoise. It belongs to the collection of National Museum of China.

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