# NaN

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Not-a-Number (NaN) is now available to be used as for an unknown or indeterminate value. The NaN symbol (∅) is entered from the keyboard using the key combination **Alt-5**. The value is unsigned.
∅ is a fixed-precision Floating Point NaN. ∅r1 and ∅x are both multi-precision Rational NaNs. ∅v is a multi-precision Floating Point NaN.

Arithmetic on NaN returns NaN unchanged. The only operation on a NaN which returns other than NaN is equality and inequality.

For example,

∅=0 0 ∅≡0 0 ∅=∅ 0 ∅ 1 0 1 ∅≡∅ 1

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