Returns the value of the first argument raised to the power of the second argument.
** operator consumes two parameters from the top of the stack (a base b and an exponent n) and pushes back the result raising b to the power of n,
i.e. bn. For special cases see pow().
Since 2.7.1, this function can be applied to a LIST of numerical values and a numerical value. Considering this function as
F, the result of
$a [ $b $c ] F is
[ $a $b F $a $c F ] and the result of
[ $a $b ] $c F is
[ $a $c F $b $c F ].
Also since 2.7.1, this function can be applied to a GTS of numerical values. This is very similar to how this function works on LISTs, considering the values of the GTS. In that case the result is a GTS.