S 04 represents the soccer club "Schalke 04" from Ruhr area in West Germany. This region is characterized by coal mining. "Schalke 04" is the famous club that miners identify with in the region. In its emblem the association abbreviations S 04 are printed in the silhouette of the mining hammer. For the exhibition DIGGING DIGGING the abbreviations of the association are removed from the flag and only the mining hammer remains.