When We think about word " infinity " , it's symbol '∞' also came in our mind and Due to the limited space available for special symbols on keyboards, the infinity symbol (∞) is nowhere to be found.
But in Both Windows-based computers and Macs have a keyboard shortcut available which will allow you to type this symbol.
For WindowsHold the "Alt " key on the keyboard and Type the Numeric Digits 2 , 3 , 6 on the Numeric Keypad , then Release Alt Key It will show you '∞' Symbol.
For MacFirst Open any application that allows text entry. then Hit the "Option" and "5" keys on the keyboard simultaneously. then Release both keys. The infinity symbol will appear to you.
Also read : How to make infinity symbol(∞) on facebook?