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Batman Logos and Signals Collection
The Bat Signal is a distress signal device that has appeared in DC Comics Batman comic books some eight decades ago. Its longevity is evident since it remains the most iconic image associated with Batman. It has been redesign numerous times throughout the years, along with many iterations of Batman storylines. As Batman fans know it is a means to summon the superhero, Batman.
The Batman Signal has appeared in numerous movies and video games. The Batman signal logo in all its many interpretations is found on a variety of Batman merchandise to DC Comics Licensed Batman toys and games and on all sorts of apparel from t shirts to couture silk shirts.
Read about the Bat Signal from this Wikipedia page.
Here is another interesting post titled Batman Logo and Its History