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Showing content from https://webplatform.github.io/docs/javascript/NaN below:

NaN Summary

A special constant that specifies a value that is Not-A-Number

Syntax

NaN

Examples

NaN mainly occurs when parsing goes wrong

parseInt(123); 
parseInt("123"); 
parseInt('foo');

NaN does not equal NaN, use the isNaN Function instead to test if a value is not a number

NaN === NaN; 
isNaN(NaN);

Remarks

The NaN constant is a member of the Global object, and is made available when the scripting engine is initialized.