The fourth album by the English rock band Led Zeppelin was released on 8 November 1971. No title is printed on the album, so it is usually referred to as Led Zeppelin IV, following the naming sequence used by the band's first three studio albums. The album has alternatively been referred to as, Four Symbols, The Fourth Album, Untitled, Runes, The Hermit, and ZoSo, the latter of which is derived from the symbol used by Jimmy Page for the album sleeve. Page often had the ZoSo symbol embroidered on his clothes.
Containing many of the band's most famous songs, including "Black Dog", "Rock and Roll", "Going to California" and the band's signature song, "Stairway to Heaven", Led Zeppelin IV was a commercial and critical success. The album is one of the best-selling albums worldwide at 32 million units. It is also certified 23-times platinum by the RIAA, making it the third-best-selling album ever in the US.