On 29 October 2004 the Heads of State and Government and the Foreign Ministers of the EU signed the Treaty establishing a Constitution for Europe in Rome. To enter into force, the Constitutional Treaty has to be ratified in all Member States. Following the rejection of the Treaty by voters in a referendum in France and the Netherlands, it is unclear at present whether and when the ratification process can be successfully concluded.

The golden stars on a blue background will continue to be the official flag of the Union.
The euro, already the official currency in 12 EU Member States, is designated the official currency of the Union.
The music to the ‘Ode to Joy’ from the Ninth Symphony by Ludwig van Beethoven, composed in 1823 in Vienna, is the official anthem of the Union. The Member States continue to have their own national anthem.

‘United in diversity’ is the motto or guiding principle of the Union.

"Europe day" is celebrated on 9 May every year in memory of the historic speech by Robert Schuman, the former Foreign Minister of France, in which he presented his vision of a united Europe.