Herma was an architectural decorative element in the form of a square pole tapering downwards, and at the top ended with a bust or a sculpture of the head. Initially (up to the 5th century BCE) the form used in Greece only for the representation of Hermes, the god of the journey. On herma also was placed the image of the phallus, which in ancient times was a symbol of happiness. Later, other gods and heroes were presented in this way.
Herma was taken over by Roman art. Busts were placed along roads, on street corners, at gates, gymnasiums, property boundaries, etc.