Sales register is a commonly used term in the retail industry that refers to a document or electronic system used to track sales transactions. However, there are many synonyms for this term that can be used interchangeably depending on the context and location. Some common synonyms for sales register include point-of-sale (POS) system, cash register, sales journal, invoice register, transaction log, sales ledger, and sales book. Each term has its own nuances and applications, but they all refer to the same essential function of tracking sales and revenue at a business. It's important for retailers to understand these different terms to communicate effectively with colleagues and customers.