It was a navigation instrument used to calculate distances and represents the importance of Portugal during the Age of Discovery, as well as the vastness of its colonial empire when the First Republic was implemented.
Sfera je bila navigacijski instrument korišten za računjanje razdaljina i simbolizira portugalski značaj tijekom vremena velikih zemljopisnih otkrića, kao i veličinu portugalskog kolonijalnog carstva u vrijeme nastanka Prve Republike.