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
Degree symbol such as Ubuntu, this symbol may be entered via the Compose key followed by , . Some keyboard layouts print this symbol upon pressing (once or twice, depending on specific keyboard layout), and, in programs created by GTK+, one can enter Unicode characters in any text entry field by first pressing , regardless of keyboard layout. For the degree symbol, this is done by entering . Degree symbol The degree symbol (°) is a typographical symbol that is used, among other things, to represent degrees of arc (e.g. in geographic coordinate systems), hours (in the medical field), degrees of temperature,