The term 'RATE INDICATOR' can be broken down into two words: 'RATE' and 'INDICATOR'. The word 'RATE' is defined as the speed or frequency at which something happens, while 'INDICATOR' is defined as a sign or signal that shows the presence or occurrence of something. Therefore, a RATE INDICATOR is an object or device that is used to measure the speed or frequency of something. It is often used in scientific experiments or industrial processes to measure the RATE of change or progress. The three-letter acronym PER is an abbreviation for 'Performance Evaluation Report', which is a document that contains information about the performance of a particular process or system. Therefore, the term 'RATE INDICATOR' can be used to refer to a Performance Evaluation Report that measures the RATE of change or progress of a particular process or system.