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

https://messiahnebo031.brightsora.com/posts/flags-as-historical-artifacts-insights-into-the-civil-war-era

The Union flag, also known as the Stars and Stripes, symbolized cohesion and patriotism, providing thirteen stripes and a discipline of blue with stars that represented each state within the union.