Null Pointer

A reference that doesn’t actually lead anywhere is called a Null Pointer.
In C and some other languages, a pointer that doesn’t actually point at anything valid is called null or dangling pointer.

Usually this happens because it formerly pointed to something that has moved or disappeared.

In layman’s language, a local phone number for a person who has since moved to the other house and that number is not reassigned to the new tenant is a dangling pointer.
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