This operation is a modulo operation, that is, it returns the remainder of the integer division of the first operand by the second. For example, 12 mod 5 would return 2, since 12 divided by 5 is 2 with remainder 2.
number mod number // Returns number currency mod number // Returns currency currency mod currency // Returns number
Depends on operand value types
3 mod 1 // Returns 0 03 mod 2 // Returns 1 185 mod 43 // Returns 13 $42 mod $15 // Returns $12