7.3.1. The euro and the cent
The euro is the currency used in most of the European Union; its subunit is the cent.
The euro

The euro area
The term ‘euro area’ is the official term for the group of countries that have adopted the euro as their single currency. All other terms, such as ‘euroland’ and ‘euro zone’, should be avoided.
Euro and ecu
On 1 January 1999, the euro replaced the ecu at a rate of one to one (Council Regulation (EC) No 1103/97 (OJ L 162, 19.6.1997, p. 1); see also Council Regulation (EC) No 974/98 (OJ L 139, 11.5.1998, p. 1)). Historical references to the ecu (prior to 1999) must remain in ecu.
The cent

The preferred form in the texts of the EU institutions and bodies is ‘cent’ (obligatory in all legal texts).
tip:
See also Section 7.3.3 ‘Rules for expressing monetary units’: