Infinite symbols (sometimes called lemniscate) are mathematical symbols representing the concept of infinity.

The lateral octagon has a long lineage; for example, it appears on the cross of Saint Boniface, wrapped around the bars of the Latin cross. However, in 1655, John Wallis introduced infinite symbols with mathematical meaning into his fault map. Wallis did not explain his choice of the symbol, but it can be inferred that it is a variant of Roman numerals, representing 1000 (initially Ci, also c), sometimes used to represent "many", or the Greek letter (Ω), the last letter in the Greek letter.

Leonhard Euler uses an open variant of the symbol to represent absolute absolute. Euler freely performs various operations on infinity, such as logarithm. The symbol is no longer used and is not encoded as a separate character in Unicode.