A Null is a item that has not been added yet, and is useless. When examined, it says ; "They body of a dwawf savaged by goblins".

Nulls should be dropped, as they don't do anything but be useless. Nulls are worthless.... 

A granite maul has the same shape as a null in an inventory, but not on the ground. Trivia: -if Checking the value of a null in the shops, you will find in the text box saying the value of the null and what it was meant to be.(ex:void stuff, ss, rune c'bow)