Representation of NaN (Not a Number).
Source position: syshelph.inc line 819
public const TExtendedHelper.NaN: Extended = 0.0 / 0.0;  | 
NaN is the Representation of NaN (Not a Number) for a Extended-sized floating point type.
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Largest possible value for the Extended floating point type.  | 
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Smallest (negative) possible value for the Extended floating point type.  | 
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Precision for this floating point type.  | 
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Positive infinity as represented by a Extended floating point type.  | 
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Negative infinity as represented by a Extended floating point type.  |