The Union flag, is known as the Stars and Stripes, symbolized team spirit and patriotism

https://shaneheqp027.slatecurrent.com/posts/the-uses-of-civil-war-flags-from-battlefields-to-museums

The Union flag, also known as the Stars and Stripes, symbolized team spirit and patriotism, that includes 13 stripes and a container of blue with stars that represented each state within the union.