A signature weapon (or trademark weapon or weapon of choice) is one commonly identified with a certain group or, in the case of literature, epic poems, comics, and film, where it is a popular trope, for both heroes and villains to be associated with and highly proficient in the use of specific weaponry. Examples include Robin Hood's longbow,^[1] Don Quixote's jousting lance, a wizard's wand, the Grim Reaper's scythe, Zeus' thunderbolt, Poseidon's trident, Thor's hammer, Arjuna's bow, the Monkey King's iron rod, a Jedi's lightsaber, William Tell's crossbow, David's sling, James Bond's Walther PPK and Gordon Freeman's crowbar. The Colt .45 SAA and Winchester are ubiquitous in Westerns. In horror cinema, there is Jason Voorhees's machete, Freddy Krueger's bladed glove and Leatherface's chainsaw.^[2]

Signature weapons enable viewers of limited animation superhero cartoons, comics, fantasy anime and mecha to easily distinguish between characters who are often nearly identical in appearance (e.g., the Teenage Mutant Ninja Turtles). Signature weapons are a common feature of role-playing games and video games, where their acquisition usually marks a newly heightened level of martial prowess and/or aids in the creation of a unique avatar.^[3][4]

Non-fictional associations include: the Japanese katana, the German Luger, the Roman gladius, the Thuggee garrote, and the American Thompson submachine gun.