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Showing content from https://cplusplus.com/reference/cmath/nan-function/ below:

function

<cmath> <ctgmath>

double nan (const char* tagp);

Generate quiet NaN

The NaN values are used to identify undefined or non-representable values for floating-point elements, such as the square root of negative numbers or the result of 0/0.

The argument can be used by library implementations to distinguish different NaN values in a implementation-specific manner.

Similarly, nanf and nanl return NaN values of type float and long double, respectively.

tagp

An implementation-specific C-string.
If this is an empty string (""), the function returns a generic NaN value (the same as returned by passing "NAN" to strtod).

isnan

Is Not-A-Number (macro/function)

nextafter

Next representable value (function)

nexttoward

Next representable value toward precise value (function)

NAN

Not-A-Number (constant)

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