On the flag of São Tomé and Príncipe we find two stars. These are said to have two different meanings: on the one hand they refer to unity with the rest of the African countries and, on the other, they represent the two main islands of the territory. You have all the information in: «The flags of Africa: images and capital of each country«.
You have all the information in: "The flags of Africa: images and capital of each country".