A power fist is a type of weapon that appears in every incarnation of the Fallout universe released thus far; one of very few weapons to claim such status. In all of its incarnations, it appears as some variation of glove or armored gauntlet, with a powered ram or similar device which improves the impact of the wielder's Unarmed strikes.
May enable such various powers and Limit Break super-attacks as: Megaton Punch, Rocket Punch, or Hand Blast. Occasionally, someone will use special combat footwear, either as a complement or alternative to this.
Subtrope of Weapon of Choice. See also Tricked-Out Gloves for a non-offensive version, and Power Palms for a more open source.