The flag of the United States is one of the nation's most widely recognized symbols. Within the U.S. it is frequently displayed, not only on public buildings, but on private residences. It is also used as a motif on decals for car windows, and clothing ornaments such as badges and lapel pins. Throughout the world it is used in public discourse to refer to the U.S., not only as a nation, state, government, and set of policies, but also as an ideology and set of ideas.
Apart from the numbers of stars and stripes representing the number of current and original states, respectively, and the union with its stars representing a constellation, there is no legally defined symbolism to the colors and shapes on the flag. However, folk theories and traditions abound.