Infinity symbol in bookbinding to indicate that a book is printed on acid-free paper and will therefore be long-lasting. In modern mysticism, the infinity symbol has become identified with a variation of the ouroboros, an ancient image of a snake eating its own tail that has also come to symbolize the infinite, and the ouroboros is sometimes drawn in figure-eight form to reflect this identification, rather than in its more traditional circular form. In the works of Vladimir Nabokov, including "The Gift" and "Pale Fire", the figure-eight shape is used symbolically to refer to the Möbius strip and the infinite, for instance
Infinity on High tours to promote the album, including the Friends or Enemies Tour, the Honda Civic Tour, and the Young Wild Things Tour. In the wake of the album's leak on the internet, the band included a download code for "Leaked in London", a live extended play, with each purchase made during the first week of its initial release. "Infinity on High" debuted at number one on the U.S. "Billboard" 200, selling 260,000 copies in its first week, making it Fall Out Boy's first number one album and second top ten effort. It also reached number one in New Zealand and opened