CVC 1 . Card Verification Code . The card verification code is an additional code printed on your debit or credit card. On most cards (Visa, MasterCard, bank cards, etc. ) corresponds to the last three digits of the number printed in the space reserved for signature on the back of the card. 2 . Central Venous Catheters, in English. Central venous catheters are also called central venous access devices or central lines. They are used to administer medicines, blood products, nutrients or fluids directly into the blood.