Clever to put that question here. There are a couple of ways to do it. Use the program character map in window and select font - Arial or New Times Roman. Find the ∞ symbol and copy it. Or you can use the ALT method. Hold ALT and press 0236 on your NUMERIC keypad and it will also type it. If you are using a laptop, you have to use the numbers printed over the letters uiojklm. But you can also just copy from here and paste where you need it.
∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞
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Infinity sign on iPhone
There is an app called the "character viewer"; see if you can find an infinity sign there.
[infinty sign]<x<[infinity sign]
The infinity sign ∞ is sometimes called the lemniscate.
The sign for infinity is ∞