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

https://ericksigh824.birchreport.com/posts/exploring-the-history-of-civil-war-flags-a-journey-through-time-2

The Union flag, which is called the Stars and Stripes, symbolized unity and patriotism, featuring thirteen stripes and a field of blue with stars that represented every country inside the union.