International Academy of Astronautics - SETI Permanent Study Group
Website excerpt: "The Flag of Earth, the unofficial banner of the IAA SETI Permanent
Study Group, flies at most SETI facilities around the world. It
symbolizes the fact that SETI is carried out on behalf of humankind
as a whole. The individual people, organizations, and nations involved
are immaterial, since any signal received will belong to all of humanity,
and represent Earth's entry into the Galactic community."