Red star on a red field. The flag of Vietnam also has a yellow star on a red field. North Korea's Red Star operating system takes its name from the communist red star. Socialist countries in Africa also incorporated the red and/or gold star into their heraldry. This practice was also adopted by countries that were formed following decolonial national liberation struggles, which often involved Marxist organizations. Transnistria and the Luhansk People's Republic are proto-states located in Eastern Europe. Due to their historical association with the Soviet Union, they have adopted socialist imagery including the red star into their flags and heraldry.
Flag of Acre diagonal line from the bottom left (hoist-side) to the upper right. The top left is yellow with a red star in the corner, and the bottom right is green. The main colors of the flag (green and yellow) are the same as the flag of Brazil and represent the state's integration with Brazil. Independently, each color has the following meaning: The red star in the upper left, called the "Altaneira Star", represents the blood of those who fought for the annexation of the current state of Acre to Brazil. The flag was officially adopted by the governor Epaminondas Jácome ().