The Cosmic Rod gives the user the ability of flight and the ability to convert the star energy into powerful blasts. Different variations have allowed different abilities including; levitating objects, creating force fields for both offense and defense, manipulating energy, and creating simple energy constructs. The rod also will "attune its self" to the user allowing the user to control the rod by thought.
Ted Knight invented the Cosmic Rod and used it to fight crime as the first Starman. It was a small handheld rod. A prototype from the next starman cosmic rod was dubbed Gravity rod.
Jack Knight uses the Cosmic Rod throughout his career as Starman. The rod is a long staff. When he retires from superheroing he gives the rod to Courtney Whitmore, the Star-Spangled Kid, who changes her name to Stargirl to respect the legacy of Starman.
Farris Knight, the DC One Million Starman and descendant of Ted Knight and Mist, used a small handheld device called the Quarvat.