по модулю("modulo" is the ablative case of the Latin masculine noun "modulus," which is defined as the absolute value of a complex number); остаток при целочисленном делении
остаток от деления(по модулю) An arithmetic operation whose result is the remainder of a division operation. For example, 17 modulo 3 = 2 because 17 divided by 3 yields a remainder of 2. Modulo operations are used in programming)