For Windows the code is -
ALT 236
(hold down the ALT key when typing in 236)
Here are is a website that contains more codes to math symbols on the computer, it might be useful to you: (See Related Link, below)
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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 ∞