A "Musketeer" refers to a member of a historical military unit that was armed with a musket, a type of firearm. The term is most famously associated with the Three Musketeers, characters from the novel by Alexandre Dumas. These soldiers were known for their bravery, skill in combat, and loyalty to their king and country during the 17th and 18th centuries in Europe. In popular culture, Musketeers are often depicted as heroic figures who engage in adventures and uphold justice. The phrase "All for one and one for all" captures their spirit of camaraderie and teamwork. Today, the term is used to evoke themes of friendship and loyalty in various media, including films and literature.