Reference FQL API reference Math Math.NaN Math.NaN Value representing Not-a-Number. Signature Math.NaN: Number Description NaN stands for Not-a-Number and Math.NaN represents a double precision floating point number that is undefined or can’t be represented. See IEEE 754 and NaN. Return value Type Description String Math.NaN Examples 0.0 / 0.0 Math.NaN Math.Infinity Math.PI