The word list ( in ... i n -- ) takes n items from the stack and places them in a list. The square brackets [ ] can be used to easily group and count stack items.
[ 1 2 3 ] list as $mylist
Note that lists can hold any combination of data types as items.
The words set ( item list index -- ) and get ( list index -- item ) access aggregate data types. Conceptually they are equivalent to Forth's ! and