The Tessen, also known as 'iron fan', is a traditional Japanese weapon that resembles an ordinary fan but is made of metal, usually iron or bronze. Although initially conceived as an object for cooling during the summer, the Tessen became a secret defensive tool used by samurai and noblewomen. Its design allowed it to hide its true nature and deploy it quickly in combat. The Tessen could be used to block blows, deflect attacks, or even as a form of improvised weapon, taking advantage of its solid structure and sharp edges.