Stun setting was the term used for non-lethal low yield settings on directed energy weapons, powerful enough to cause disorientation, unconsciousness, and minor skin burns to a humanoid lifeform. (TOS: "The Man Trap" ; TNG: "Samaritan Snare" ; VOY: "Distant Origin") A phaser set to stun could render a Human female unconscious in 0.9 seconds, something that was of no use to Miles O'Brien when a Pah-wraith possessed his wife, as it was still more than enough time for the Pah-wraith to kill her. (DS9: "The Assignment")