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

https://lorenzoomka633.fairmontdigest.com/posts/embodying-history-the-role-of-civil-war-flags-in-reenactments-3

The Union flag, known as the Stars and Stripes, symbolized solidarity and patriotism, that includes 13 stripes and a field of blue with stars that represented each country in the union.