Ninja stars, also known as shuriken, are traditional Japanese concealed weapons used by ninja for distraction or to injure an opponent. They are typically flat and star-shaped, with multiple sharp points. While often associated with martial arts and popular culture, their historical use was more practical, serving as tools for stealth and surprise. These weapons come in various designs, including the classic four-pointed star and other shapes like circles or triangles. Although they are often depicted in movies and video games, actual ninja training focused on a range of skills, including stealth, strategy, and the use of various weapons beyond just shuriken.