1) The base of this flag is Poland, but also Czechia if you remove the blue triangle.
2) The ring in the center surrounds the stars, uniting them.
3) The stars represent the four major regions; Poland, Czechia, Slovakia, and Hungary.
4) The positions of the stars create a map of the four original capitals of each country.
5) The 3 colors are Red, White, and Blue, which are major colors found on the four original flags except for Hungary's green color.