In the Dune universe, the gom jabbar is a small, poisoned needle that the Bene Gesserit use to test a person's humanity by threatening them with death. The needle serves as a tool to train their initiates in controlling their emotions. The gom jabbar is only wielded by trained individuals, and it symbolizes the power and control of the Bene Gesserit.

The gom jabbar is first introduced in the novel Dune, where Paul Atreides undergoes a test administered by the Bene Gesserit Reverend Mother Gaius Helen Mohiam. Mohiam uses the gom jabbar to test Paul's ability to control his fear, which he ultimately passes. The needle's potency and the threat of death leave Paul shaken.

Throughout the Dune universe, the gom jabbar remains a prominent element used to test the humanity of the Bene Gesserit's initiates and to intimidate their enemies. The needle's use reminds others that the Bene Gesserit are not to be underestimated, and it serves as a symbol of their power and control.
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