<< shifts all bits in the argument number INTEGER to the left by argument places. This has the effect of multiplying the argument number by two for each shift given in the argument places. Both arguments, numbers and places are integers. This is easiest to see in a binary number. For example %0101 << 1 return the binary number %01010. In base 10 numbers this looks like 5 << 1 and returns 10.
Shift operations can not be used on SINGLE variables