The Union flag, is called the Stars and Stripes, symbolized harmony and patriotism

https://simonadmb548.valiantfield.com/posts/civil-war-flag-variations-understanding-regional-differences-and-designs-2

The Union flag, often known as the Stars and Stripes, symbolized cohesion and patriotism, proposing 13 stripes and a container of blue with stars that represented every state inside the union.