This picture shows a double vortex in the atmosphere of Venus. A vortex is a swirling, circular movement of air and clouds... like in a tornado or hurricane. Venus has two vortices above the South Pole, and two more above the North Pole. This picture shows the ones at the South Pole.
Image courtesy of ESA/VIRTIS/INAF-IASF/Obs. de Paris-LESIA.