The value that is obtained by converting the number 0 into a pointer, for example, (void *) 0. The C and C++ languages guarantee that this value will not match that of any legitimate pointer, so it is used by many functions that return pointers to indicate an error. X/Open.
a language concept whose particular internal value does not matter
a perfectly valid value for a pointer to have
a pointer in a computer program that does not point to an object
a pointer value that points to no valid location
a pointer which doesn't point anywhere
a pointer with a reserved value, often but not necessarily the value zero, indicating that it refers to no object
a regular pointer of any pointer type which has a special value that indicates that it is not pointing to any valid reference or memory address
a special pointer value that is known not to point anywhere
a special value that is known to not point anywhere
a valid value for a BSTR variable
a value that any pointer may take to represent that it is pointing to "nowhere", while a void pointer is a special type of pointer that can point to somewhere without a specific type
a value that you assign to a pointer variable when you want it to point to nothing in particular
A pointer to nothing, expressed as the value 0.
An access value which does not refer to any object.
n. A distinguished pointer value which is not the address of any object or function. See question 5.1.