First you make a gun like thing, with your pointer finger and thumb. (Both Hands)
Next, you take your right pointer finger and connect it with your left thumb, after that you do the same with your left pointer to your right thumb. During this process you make your fists together, they have to be excatly matching (Your fingers are lined up in fists) Finally, it should be like an turned over hourglass shape. You could leave it like this OR curve it into an eight to make it the exact infinity sign.
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The mathematical symbol for "undefined" is the infinity symbol.
(0, infinity) Note that you should use the infinity sign instead of the word (the sideways 8).
turn 8 90 degrees clockwise
Hold Alt + 252 for ⁿ253 for ²228 for Σ227 for pi251 for √ (square root)236 for ∞ (infinity)241 for ±247 for ≈Make sure your keypad is on NumLock
Technically speaking, infinity is not a definable number, and therefore, it cannot be altered by multiplication.