HI,

IN KARNATAKA STATE there is various category, 3BKH IS a CATEGORY NAME AND what you have seen in counselling , the seats which are specially kept for 3BKH category. Castes which belong to 3B category IS  Lingayaths, Vaishnavas, Bunts, Digambara Jains, Christians, Maratha, Kuruba etc as identified  by the Backward Classes department of Government of Karnataka. kh Stands for karnataka-hyderabad .