Call signs in Europe is a code consisting of a three letter country code and a series of letters and numbers, used as unique identifiers for broadcasting and telecommunications. These are not designated formally to all broadcast stations in Europe like they are in other parts of the world, but some broadcasters have developed their own makeshift call signs. It is quite common that instead of regular call signs abbreviations of the stations' names are used (e.g. ARD, RTL in Germany, ORF in Austria, BBC, ITV or SKY in the United Kingdom, TF1 in France, TV3 in Spain, etc.). In most of Europe, TV and radio stations have unique names, such as ProSieben in Germany, France 2 in France, Nova Television in Bulgaria, Antena 3 in Spain, etc.