NaN
From NARS2000
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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