From Discworld MUD Wiki
A human <right/left> arm.
This is a <freshness> <right/left> arm severed from the corpse of a human.
The human <right/left> arm is about two and a half feet long and about three inches wide. It is made of human flesh.
You heft the human right arm and guess that it weighs about ten pounds.
It is a required (consumed) spell component in the following spells:
Dead humans. Bring a sharp weapon and get as many as you need*!
(*)Maximum 2 per container.