The nickname for the United States flag is "Old Glory." This term is believed to have originated in the early 19th century and is often attributed to a captain named William Driver, who used it to describe his flag. The phrase embodies a deep sense of patriotism and pride, symbolizing the principles of freedom and democracy that the United States stands for. Over the years, "Old Glory" has become an affectionate reference to the flag, reminding citizens of their national identity and shared values.