From Wikipedia, the free encyclopedia: A bobblehead doll, also known as a bobbing head doll, nodder, or wobbler, is a type of collectible doll. Its head is often oversized compared to its body. Instead of a solid connection, its head is connected to the body by a spring in such a way that a light tap will cause the head to bobble, hence the name. Read more here.
Bobblehead dolls represent a variety of people and characters. Giveaways at sports venues are a common use of bobbleheads. This bobblehead doll depicts a NY firefighter holding an American flag. This is a tribute that was offered after 9/11. There were a number of doll variations, ranging from a cop to eagle to lady liberty.