euroeuro sn, €, symbol for the euro, the official currency of the European Union and several areas outside the EU, including Andorra, Montenegro, Kosovo, San Marino, and the U.K. soverenty base areas of Akrotiri and Dhekélia.. Desn.The system was introduced for UEFA EURO 2016, with Portugal among the sides to finish third in their group. Fernando Santos's charges reached the last 16 on goal difference alone – before going