BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Clone Wars
This one-shot shows Grievious at his most ruthless, taking out any Jedi who stand in his way and adding more lightsabers to his ever-expanding collection.
THE FEARSOME SEPARATIST GENERAL STRIKES! In his hunt to kill Jedi, GRIEVOUS stumbles across a power greater than he imagined. What secrets will the killer cyborg find inside a lost Jedi temple? Can Grievous strike a blow against the very FORCE itself?