Nike was the ancient Greek goddess of Victory, being sister to Zelos (zeal), Kratos (strength) and Bia (force). She was typically depicted with outstretched wings and one foot forwards, at the moment of landing on the prow of a ship. (The Samothrace Nike in the Louvre provides the best example). A laurel wreath is usually held aloft in one hand, ready for crowning the victor.
This allegorical genre is still much used, albeit for the personification of different themes. A relatively modern example is Peace Descending on the Quadriga of War by Adrian Jones atop the Wellington Arch at Hyde Park Corner.