LED ZEPPELIN IV is the fourth album by English rock band Led Zeppelin, released on November 8, 1971. It has no easily expressed official title and is commonly referred to as Led Zeppelin IV. Atlantic Records catalogues have used the names Four Symbols and The Fourth Album, and it is also variously referred to as Untitled, Runes, Sticks, Man with Sticks, Four and ZoSo (after the appearance of the first character or symbol printed on the LP label). Led Zeppelin guitarist Jimmy Page frequently refers to the album as Led Zeppelin IV in interviews, while singer Robert Plant thinks of it as "the Fourth Album, that's it." The album is one of the best-selling albums in history, with over 23 million units sold in the United States alone. Estimates for worldwide figures usually top 30 million units.