Illustration of a black bat on a silver background
Batman is a fictional superhero in the DC Comics world. He first appeared in 1939 as part of Detective Comics #27 written by Bill Finger and illustrated by Bob Kane. He gained his own comic book title, Batman, shortly after in 1940. The character is referred to by several names including "the Caped Crusader," "the Dark Knight," and "the World's Greatest Detective."
Unlike most superheroes, Batman does not have any super powers. He is an American billionaire and philanthropist, who having witnessed the murder of his parents as a child, serves as a vigilante to the fictional town of Gotham. Rather than supernatural skill, he relies on his intellect, martial arts skills, physical prowess, detective skills, technology, and wealth to fight crime.
When Batman is needed, the Gotham City police use a searchlight with a bat-shaped insignia over the lens called the Bat-Signal, in order to alert his attention. The bat symbol has evolved since its origin in the 1940s. The insignia on the button most closely resembles the 2004 logo.