an accountant or bureaucrat who is believed to place undue emphasis on the control of expenditures
A person who is excessively interested in controlling or reducing expenses, increasing profits, or in quantitative details in general. The term is often used to imply the person is a pedant and incapable of seeing other things or the bigger picture (more general things), but it is also widely used as a mildly derogatory term and even facetious synonym for accountants, CEOs, CFOs, business and government officials responsible for financial decisions, etc.