Our Batman Dragon Heads Logo apparel collection features two teal blue dragon heads snarling on each side of a blue and black circular Batman insignia. It's a Batman logo with a twist!
You can find the Dragon Heads Logo on six styles of black adult t shirts, polo shirts, tank tops, long sleeve shirts and 2 styles of sweatshirts as well as a youth t shirt and hoodie.
The Bat Signal is a distress signal device that first 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 Batman story line iterations.
As Batman fans know it is a means to summon the superhero, Batman.
Read about the Bat Signal from this Wikipedia page.
Here is another interesting post titled Batman Logo and Its History