Wiktionary
supergold
a. (context rare English) Above the gold or premium level; highly exclusive.
Wikipedia
Supergold
Supergold was an oldies radio sustaining service operated by Chiltern Radio Group in the United Kingdom. Originally devised by entrepreneur and DJ Graham Kentsley, it was one of Europe's first satellite delivered radio stations, receiving a Satellite Television Technology International (STTI) award for satellite communication innovation.