Indicates when a variable or expression does not evaluate to a numeric value.
function IsNan(const AValue: Double): Boolean; overload; function IsNan(const AValue: Single): Boolean; overload; function IsNan(const AValue: Extended): Boolean; overload;
Boolean IsNan(const Double AValue); Boolean IsNan(const Single AValue); Boolean IsNan(const Extended AValue);
Use IsNan to test whether the value specified by AValue represents NaN (not a number). Note that NaN is distinct from positive and negative infinity, which can be detected using the IsInfinite function.
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