 In the original series, the "arrowhead" badge worn by the crew of  the Enterprise was meant to be an insignia for the Enterprise. If  youll notice on any "guest" Starfleet character, they all wear  different symbols on their uniforms. And "Commadores" wore a  "starburst" or "sun" insignia. By the time Star Trek hit the big  screen, the Arrowhead insignia was adopted as the "official"  Starfleet symbol and has remained so throughout the films and  spin