The sign of infinity (∞), infinity or infinity, means "no boundary". It has different concepts in theology, philosophy, mathematics and daily life. Usually the use of this word does not involve its more professional definition.

Mobius belt is usually regarded as the creative source of the infinite symbol "∞", because if someone stands on the surface of a huge Mobius belt and walks along the "road" he can see, he will never stop. But this is an untrue rumor, because "∞" was invented before Mobius belt.

Aristotle (384-322 BC), an ancient Greek philosopher, believed that infinity could exist, because a finite quantity was infinitely separable and could not reach the pole, but infinity was universally acknowledged as unreachable.

/kloc-in the 20th century, a great Indian mathematician, Bascara, appeared, and his concept was close to that of modern theorization. The symbol of putting 8 horizontally as ∞ to represent infinity was first put forward in john wallis's paper Arithmetic Infinity (published in 1655).