What is bat kd?

As an AI language model, I don't have any specific information about "bat kd." It is possible that you made a typo and meant "Batman," a fictional superhero created by artist Bob Kane and writer Bill Finger, appearing in American comic books published by DC Comics. Batman's alter-ego is Bruce Wayne, a wealthy businessman who uses his physical and intellectual prowess to fight crime in the city of Gotham. Batman has become a cultural icon and is one of the most iconic and recognizable characters in the world.