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A Credit Card Number


A credit card number is the unique number imprinted on a credit card. The first six digits on a credit card are called the issuer identification number. They identify the issuer -- Discover, or American Express, for example. The remaining digits of a credit card number are unique to the individual card. Credit card numbers are usually embossed, a remnant the days when a physical impression of credit cards were made through zip-zap machines.