The diencephalon, also known as the interbrain or betweenbrain, is one of the major areas of the brain, along with the brainstem, cerebellum, and cerebrum. This structure in the brain contains a number of smaller components of the brain which perform a variety of roles to keep the body functioning.
Security code. The security code on a credit card is the brief number that is printed on the card that helps verify its legitimacy. Depending on the card, the security code can be a three-digit or four-digit number, printed on either on the back of the card or the front, and goes by several names. The most common is CVV, which stands for card verification value code.
The CVN code is a special 3-4 digit code used as a security measure for all Internet transactions. It is called CVV2 (Credit card Verification Value) for Visa cards and CVC2 (Credit card Verification Code) for MasterCard. Since the CVN is listed on your credit card, but is not stored anywhere, the only way to know the correct number for your credit card is to physically have possession of the card itself. Because of this, it is a security enhancement against misuse of credit cards. All VISA, MasterCard and American Express cards newer than 5 years have a CVN. Note: The CVN code is printed on your card; it is not raised from the surface of the card like your credit card's account number.