'Convergence and the Cauchy property of sequences in the setting of actual infinity'. Cosmic Imagery: Key Images in the History of Science. Commentarii Academiae Scientiarum Petropolitanae (in Latin). 'Variae observationes circa series infinitas' (PDF). It can be seen as Euler used it on page 174 of Euler, Leonhard (1744). ^ Cajori (1929) displays this symbol incorrectly, as a turned S without reflection.A Brief History of Infinity: The Quest to Think the Unthinkable. Princeton, New Jersey: Princeton University Press. To Infinity and Beyond: A Cultural History of the Infinite. A History of Mathematical Notations, Volume II: Notations Mainly in Higher Mathematics. 'Signs for infinity and transfinite numbers'. De Sectionibus Conicis, Nova Methodo Expositis, Tractatus (in Latin). 172: 'Within this type the lemniscate (∞) is a commonly used motif.' 'Viking Age Combs: Local Products or Objects of Trade?'. Zero to Lazy Eight: The Romance of Numbers.

Infinity and the Mind: The science and philosophy of the infinite. The Unicode set of symbols also includes several variant forms of the infinity symbol that are less frequently available in fonts in the block Miscellaneous Mathematical Symbols-B. An encircled version is encoded for use as a symbol for acid-free paper.

Infinity symbol on keyboard windows 7