The notation "Z/nZ" represents the set of integers modulo n, where n is a positive integer. This structure consists of the integers 0, 1, 2, ..., n-1, with addition and multiplication defined modulo n. Essentially, it groups integers into equivalence classes based on their remainders when divided by n. In this context, Z refers to the set of all integers, while n is a specific integer that determines the size of the group. The operation of addition or multiplication in Z/nZ wraps around once it reaches n, creating a cyclic structure that is fundamental in various areas of mathematics, including group theory and number theory.