This relief of Goddess Nike at the Domitianus Square is considered to have been a decorative element on the second story of the Heracles Gate on the Part of the Curetes.
Meaning victory in Greek, the Goddess was generally depicted as the young winged girl descending swiftly from the skies to bring victory. 

Remaining faithful to this archetype presentation in this relief Nike is seen clutching a palm branch on her right hand and a  laurel wreath on her left, being a symbol of Victory Nike  was a frequently used motif in architectural and decorative structures.