Infinity Symbol (∞)

The infinity symbol was introduced by English mathematician John Wallis in 1655, in his work De sectionibus conicis (Treatise on Conic Sections). Wallis used the sideways figure-eight shape, technically called a lemniscate, to represent a quantity without bound.

Why that particular shape isn't fully settled. One theory holds it's a stylized version of the Roman numeral for 1,000 (sometimes written CIƆ or a similar rounded form), which Romans occasionally used loosely to mean "countless." Another points to the lowercase Greek letter omega (ω) — the final letter of the Greek alphabet — as a natural symbol for an endpoint that never actually arrives. Whatever its origin, the symbol was adopted quickly and became the universal notation for infinity in calculus and beyond by the 18th century.

Outside of math, ∞ has settled into a small, consistent set of everyday meanings: endless love, unbreakable friendship, and limitless possibility. It's one of the most common tattoo and jewelry motifs for exactly that reason — a single, simple line with no natural stopping point reads instantly as "forever," which is why it shows up so often on wedding and promise rings, matching couple or best-friend tattoos, and memorial pieces worn in remembrance of someone who died.

A common variation weaves two initials, a name, or a date into the loops of the symbol itself, turning the generic "forever" into something specific to two people or a particular relationship. The symbol also carries a lighter, more general sense of "no limits" — used in mottos, brand names, and captions to mean boundless potential rather than a specific bond.