The Erusian Foli is the official and national currency of the Federal Republic of Erusea. It has never made an appearance in the Ace Combat series but is a national symbol to the Erusian people. The Foli, behind the Osean Zollar, is one currency that has the most value than any other national or multinational currency in the Ace Combat World. It represents similarities to the Japanese Yen and the Chinese Yuan from the real world universe.