A projected reversal point, also known as a PRP, is a key concept in Gann theory that refers to a price level where a change in trend is expected to occur. This tool is based on the idea that price movements in financial markets follow specific patterns and can be predicted using mathematical calculations. PRPs are important because they can help traders make informed decisions about when to buy or sell assets. Understanding this concept is crucial in the world of finance and can greatly enhance one's trading strategies.