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dangling pointer

dangling pointer: n. A reference that doesn't actually lead
   anywhere (in C and some other languages, a pointer that doesn't
   actually point at anything valid).  Usually this happens because it
   formerly pointed to something that has moved or disappeared.  Used
   as jargon in a generalization of its techspeak meaning; for
   example, a local phone number for a person who has since moved to
   the other coast is a dangling pointer.