Multiple choice ________ is a 3 digit number on debit cards for security purpose. PIN Password TPIN CVV CTS Reveal answer Fill a bubble to check yourself D Correct answer Explanation CVV is a 3 digit number on debit cards for security purpose. The CVV (Card Verification Value) on your credit card or debit card is a 3 digit number on VISA and MasterCard branded credit and debit cards.