The hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone.The ball is the femoral head, which is the upper end of the femur (thighbone).he hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone.
Most of us carry credit cards and ATM cards. These, typically, have sixteen digits on the front. These digits are the unique account number for the card. For obvious reasons, just any sixteen digits will not work, they follow pattern. The first few characters of the card number describe the type of card.
For example, the MasterCard system is identified by the number 5, American Express and Diners Club credit card numbers start with the number 3, while Visa and Discover Card systems are identified by the numbers 4 and 6, respectively. Each credit card number has a structure that varies by system. In the MasterCard system, digits two through six are used to identify the bank number, digits seven through 15 designate the account number and digit 16 represents a check digit.