The term "(p-1)" often refers to a mathematical expression where "p" is a variable, and the expression represents one less than the value of "p." This notation is commonly used in various fields of mathematics, including algebra and number theory, to simplify equations or to denote a specific value in calculations. In the context of prime numbers, if "p" is a prime number, then "(p-1)" represents the largest integer less than "p." This concept is significant in areas such as cryptography and modular arithmetic, where understanding the properties of prime numbers, like p, is essential for secure communication and data encryption.