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

https://troynvgr831.moderncairn.com/posts/flags-of-honor-the-symbolism-behind-civil-war-colors-and-emblems

The Union flag, is known as the Stars and Stripes, symbolized team spirit and patriotism, providing thirteen stripes and a container of blue with stars that represented every kingdom in the union.