The notation "(n)" typically represents a variable or a placeholder for a number in mathematics and computer science. It is often used in equations, algorithms, or functions to denote an integer value that can change or vary. For example, in a sequence, "(n)" might indicate the position of a term, such as the nth term. In programming, "(n)" can also refer to the size of a data structure, like an array or list. It helps in analyzing the efficiency of algorithms, particularly in terms of time complexity and space complexity, where the performance may depend on the value of n.