Credit Card Numbers - Visa. These Credit card numbers validate for Visa credit cards. The number and information is as real as it can be, and contains valid bin information. The structure of the credit card number starts with a valid bin number and also validates against the LUHN's formula.
UART is a protocol (Universal asynchronous receiver/transmitter ) for serial transfer of information. You ask about an embedded system with mentioning which so I'll assume that you have a block diagram with one indicating UART.
Universal Access Number - UAN. Any organization or business that operates at several different locations has a great concern to provide timely and more convenient services to its customers. Some users may choose to connect incoming calls to different places at different times e.g. during or after working hours, or during weekends or holidays.