The term BUS can be used to refer to a number of different roles in the business world. An EXEC is an executive, typically a high-ranking member of a company's management team. A CEO is a Chief Executive Officer, the highest-ranking executive in a company. A CFO is a Chief Financial Officer, responsible for managing the financial operations of a company. Finally, a MGR is a Manager, someone who oversees the day-to-day operations of a business. All of these roles are considered to be bigwigs in the business world, as they are all responsible for making important decisions that can have a major impact on the success of a company.