From Clomosy Docs

The mod keyword returns the remainder of the division of two numbers. The integer result of the division is ignored.

Example
In the example, it will return the remainder of dividing 20 by 12. So as a result you will see the value 8 on the screen.

var
  dividingNumber,divisor,remainder : Integer;
 
{
  dividingNumber = 20;
  divisor = 12;
  remainder = dividingNumber Mod divisor;
  ShowMessage(IntToStr(dividingNumber)+' Mod '+IntToStr(divisor)+' :'+IntToStr(remainder));

}

Output:

See Also