What did gold stars in windows mean during World War 2?
A family member had died in the Armed Forces.
It meant that a family member had died in the service. These little banners could be purchased, with one, two, three or four blue stars, to show how many were in the service. If one was killed, you'd need a new banner with a gold star, and another with blue stars for any remaining family members in the service. There is still a national organization of Gold Star Mothers.