What does spangled mean in the Star Spangled Banner?

The Word "spangled" is an old Word that is not used much in conversation these days, except in the National Anthem. It means "having spangles". A "spangle" is a small and shiny object, often sewn onto fabric to use as a decoration. Probably, Francis Scott Key thought the stars in the flag reminded him of the stars in the sky, because the stars were glittering and beautiful; and seeing the flag still waving after a difficult battle in the war, was also beautiful to him.