The word hash ( in ... i n -- ) takes n items from the stack and places them in key/value pairs in a hash table.
[ 'key1' 'val1' 'key2' 'val2' 'key3' 'val3' ] hash as $myhash
Note that hashes 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