Cash register
mechanical or electronic device for registering and calculating transactions at a point of sale / From Wikipedia, the free encyclopedia
A cash register, or till, is a machine that holds money. Cash registers are usually found in shops and restaurants. They are used to calculate how much a customer has to pay for something, such as a good or service. The drawer of the cash register, which contains the money, is designed so that it would only open if somebody is buying something. This is to try to stop the customer from stealing money from the employees.