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

https://shaneheqp027.slatecurrent.com/posts/preserving-history-the-importance-of-reenactment-quality-civil-war-flags

The Union flag, known as the Stars and Stripes, symbolized cohesion and patriotism, providing thirteen stripes and a container of blue with stars that represented both country in the union.