About this infinity symbol
The infinity symbol is U+221E, and its formal name is the lemniscate, the sideways figure eight introduced by John Wallis in 1655. In mathematics it is not a number: writing that a limit tends to ∞ describes unbounded growth rather than arrival at a value, which is why expressions like ∞ minus ∞ are undefined. Outside mathematics it carries the everyday sense of endlessness, which is how it ended up on jewelry and in bios. Two neighbors get confused with it. The permanent paper sign ♾ (U+267E) is visually similar and renders as an emoji on many platforms, and a plain figure eight rotated in a graphics program is not a character at all and will not survive being copied as text. Use U+221E and the meaning travels with the text.