The yellow sphere in the centre of the flag is a navigational instrument used during the 'Age of Discovery'. It's a symbol that shows Portugal's history as a great maritime nation, embodying the spirit of adventure and discovery.

The five small blue shields inside the main shield represent the victory of Portugal's first king, and the seven castles around it represent castles captured from the enemy. This flag, filled with historical pride, is now popularly used in various contexts, like when K-pop fans talk about concerts in Portugal or when planning a trip to Europe.