The format and position of the security code varies across card schemes. Some cards have a three-digit number printed at the end of the cards’ signature strip. Some (AMEX cards for example) have a four digit number on the front of the card. Some card issuers refer to this number as the 'Security Code', others as the 'personal security code' and others as 'Card Verification Value'. In addition, it may also go by the name of 'CVV2' for Visa Cards, 'Card Verification Code' (CVV) for Mastercard/Eurocard and 'Security Code' for AMEX cards