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

https://shaneheqp027.slatecurrent.com/posts/reenactment-use-of-civil-war-flags-bringing-history-to-life-2

The Union flag, often called the Stars and Stripes, symbolized solidarity and patriotism, proposing 13 stripes and a discipline of blue with stars that represented every nation in the union.