The Union flag, is named the Stars and Stripes, symbolized unity and patriotism

https://damienqulw756.laurelcurrent.com/posts/connecting-generations-through-history-teaching-kids-about-civil-war-flags-3

The Union flag, also known as the Stars and Stripes, symbolized harmony and patriotism, presenting thirteen stripes and a subject of blue with stars that represented every nation within the union.