Led Zeppelin 's fourth album is also known as the Hermit album .
In response to the treatment they had received from critics , particularly after Led Zeppelin III , the band decided to release the fourth album with no title , though it is variously referred to as Led Zeppelin IV , Untitled , IV , or , due to the four symbols appearing on the record label , as Four Symbols , Zoso or Runes .
Led Zeppelin