NaN - MDN Web Docs Glossary: Definitions of Web-related terms …
https://developer.mozilla.org/en-US/docs/Glossary/NaN
WEBJun 8, 2023 · NaN (Not a Number) is a numeric data type that means an undefined value or value that cannot be represented, especially results of floating-point calculations. For example, NaNs can represent infinity, result of division by zero, missing value, or the square root of a negative (which is imaginary, whereas a floating-point number is real).
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