The Gom Jabbar, also known as "the high handed enemy", was a handheld needle tipped with meta-cyanide poison. When driven into a victim it brought almost instantaneous death.
All the noble houses kept a Gom Jabbar of some sort, and used it to dispose of rivals and enemies under certain circumstances.
- Size: 3 - 4 centimeters
- Mass: Negligible
The Gom Jabbar Test of Humanity
- "It kills only animals, Let us say I suggest you may be human. Steady! I warn you not to try jerking away. I am old, but my hand can drive this needle into your neck before you can escape me."
- ―Reverend Mother Gaius Mohiam while testing Paul Atreides with a Gom Jabbar[src]
The Bene Gesserit also made extensive use of the Gom Jabbar, especially when they tested the humanity of certain individuals. In such circumstances, the device was placed against the subject's neck and acted as a deterrent for them backing out of the test. Such a method was used by Reverend Mother Gaius Helen Mohiam against Paul Atreides before his arrival on Arrakis.
The gom jabbar test would be to determine whether an individual's awareness was stronger than their instincts. If their awareness of the gom jabbar's presence was strong enough, it would override their instincts to withdraw from the test, which usually involved great physical pain.