A stab wound was a type of puncture inflicted by a knife or other sharp, elongated object. They were usually deliberately intended to cause harm to oneself or another.
In 2266, Lieutenant junior grade Joe Tormolen died after a self-inflicted stab wound. (TOS: "The Naked Time")
In 2370, Data stabbed Deanna Troi in an attempt to remove the mouth he thought he saw on her shoulder. The stab wound was later treated in sickbay by Doctor Beverly Crusher and Martinez. (TNG: "Phantasms")
Doctor Tolen Ren, a Banean scientist, was stabbed in 2371. (VOY: "Ex Post Facto")
The holographic character Freya was killed by Unferth when he stabbed her with a knife. (VOY: "Heroes and Demons")
In 2375, Benjamin Sisko was stabbed by a member of the Cult of the Pah-wraiths. (DS9: "Image in the Sand")