The term "signature weapon" refers to a specific type of weapon that is uniquely associated with or identified as belonging to a particular character, group or organization within a fictional narrative. This could include anything from a sword wielded by a samurai warrior to a high-tech gadget used by a spy or superhero. The term "signature" suggests that the weapon is not just any ordinary tool but one that represents and reflects the personality, skills, abilities, and values of its owner. It becomes an extension of their identity and often plays a significant role in defining who they are within the storyline.