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Implementation Defined Behavior
An example of implementation defined behavior would be the size in bytes of a pointer: on a 32 bit machine it would be 4 bytes, on a 64 bit machine it would be 8 bytes. Minimizing implementation defined behavior in the language will maximize the portability of code.
Another example of implementation defined behavior is the size of the "real" type. It will be either 64, 80 or 128 bits depending on the target hardware platform.
NaN ("not a number")
NaN (Wikipedia) (see also: NG:digitalmars.D.learn/12543)
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