Wand of nothing

From Wikihack

A wand of nothing does absolutely nothing, whether zapped, engraved with, or when broken.

This makes it problematic to identify; the best method is to use a scroll or spell. Since the only other wand with base price 100, light, is very easy to identify, price IDing is another method to identifying a wand of nothing.

[edit] Generation

Wands comprise 4% of all randomly-generated items in the main dungeon, 6% in containers, 5% on the Rogue level, and 8% in hell. There is a 2.5% chance that a randomly-generated wand will be a wand of nothing.