Switch on the 'Num lock' and press and HOLD the 'Alt' key,
now type 236 on the num-lock keypad.
Release 'Alt' key = Infinity symbol '∞'
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If you are using a text application such as Microsoft Word, QuarkXpress, InDesign, etc., you can type "option 5" and that will give you an infinity sign. -Tonypro Or you can type alt+236 and it will show up as ∞
Infinity sign on iPhone
∞ -- 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.
[infinty sign]<x<[infinity sign]
The infinity sign ∞ is sometimes called the lemniscate.