This piece is the relief of Faravahar. The ancient image of a winged man with more than 4500 years of history recorded on mountains and rocks, palaces and temples in the vast geography of ancient Iran. 
Faravahar symbolises the innate movement of human towards goodness based on three principles of good words, good deeds, and pleasant thoughts.

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Farvahar symbol was the ancient Aryan name for what we now call "spirit". It is known as "Fravashi" in Avestan and "Ferorti" in ancient Persian, and it is the essence of existence that is eternal, and immortal. It is referred to as an Ahura ray given to humans.