Euro banknotes a common theme of European architecture in various artistic eras. The obverse of the banknote features windows or gateways while the reverse bears different types of bridges. The architectural examples are stylised illustrations, not representations of existing monuments. All the notes of the initial series of euro notes bear the European flag, a map of the continent on the reverse, the name "euro" in both Latin and Greek script (EURO / ΕΥΡΩ) and the signature of a president of the ECB, depending on when the banknote was printed. The 12 stars from the flag are also incorporated into every note.
Banknotes of the pound sterling William Shakespeare on the reverse. The Series D £1 note, featuring Sir Isaac Newton, was discontinued in 1984, having been replaced by a pound coin the year before, and was officially withdrawn from circulation in 1988. Nonetheless, all banknotes, regardless of when they were withdrawn from circulation, may be presented at the Bank of England where they will be exchanged for current banknotes. Other banks may also decide to exchange old banknotes, but they are under no obligation to do so. When Series E was introduced in 1990, a new portrait of the Queen was commissioned based on photographs by