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The infinity symbol is a mathematical symbol that represents an infinitely large number. The infinity symbol is written with the Lemniscate symbol: ∞ It represents an infinitely positive big number. When we want to write an infinitely negative number we should write: -∞ When we want to write an infinitely small number we should write: 1/∞ Is infinity a real number?Infinity is not a number. It does not represent a specific number, but an infinitely large quantity. Infinity rules & properties Name Key typePositive infinity ∞ Negative infinity -∞ Infinity difference ∞ - ∞ is undefined Zero product 0 ⋅ ∞ is undefined Infinity quotient ∞ / ∞ is undefined Real number sum x + ∞ = ∞, for x∈ℝ Positive number product x ⋅ ∞ = ∞, for x>0 How to type infinity symbol on keyboard Platform Key type Description PC windows Alt+236 Hold the ALT key and type 236 on the num-lock keypad. Macintosh Option+5 Hold the Option key and press 5 Microsoft word Insert > Symbol > ∞ Menu selection: Insert > Symbol > ∞ Alt+236 Hold the ALT key and type 236 on the num-lock keypad. Microsoft excel Insert > Symbol > ∞ Menu selection: Insert > Symbol > ∞ Alt+236 Hold the ALT key and type 236 on the num-lock keypad. Web page Ctrl+C, Ctrl+V Copy ∞ from here and paste it in your web page. Facebook Ctrl+C, Ctrl+V Copy ∞ from here and paste it in your Facebook page. HTML ∞ or ∞ ASCII code 236 Unicode U+221E LaTeX \infty MATLAB \infty Example: title('Graph to \infty') Infinity in set theory Aleph-null (
Aleph-one (
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