UniWind / GUAT stands for Der Universitätsverband zur Qualifizierung des wissenschaftlichen Nachwuchses in Deutschland e.V. / the German University Association of Advanced Graduate Training.
It is a collective of universities that aims to support young researchers and their academic and professional goals. They offer opportunities to network and communicate with other scientists and educators with the goals of improving the quality of academic education, improving the conditions for doctoral and postdoctoral researchers, and increasing career opportunities for scientists both within academia and in private industry.
More information can be found on their website.