Infinity is not "the" number symbol. It is simply a symbol that represent the limit of very large numbers and saves people from having to write that long phrase every time.
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No, infinity is not a number, in the mathematical sense. It is a symbol for "unlimited". As such it has uses in various theories in math and in physics. The simplest proof is adding a real value, such as 1, to infinity. Just as zero times any number is still zero, infinity plus any value will remain "infinity".
The symbol for infinity looks like a horizontal 8.
∞ -- Copy and paste this character if you want to use an infinity symbol on your iPhone. There is no infinity symbol available on the standard iPhone keyboard.
Infinity is not a number in the ordinary sense of the word and so there is no numeral. It is represented by the lemniscate symbol, ∞.
Stating infinity as a fraction is something like trying to find what is north of the north pole. Infinity can only be infinity.