TCB stands for Taking Care of Business. Elvis had rings and necklaces made with TCB in the center, flanked by lighting bolts. He gave them to his bodyguards and friends.
"TCB" was a motto of sorts for Elvis, and stands for "taking care of business." The initials appeared on a wide range of his clothing, and are used today.
elvis's motto for himself and his "memphis maphia" was taking care of business in a flash usually signified by the letter tcb with a lightning bolt in the middle.