The term 'NOT TAKEN' can be broken down into three crossword solutions: FREE (4 letters), LEFT (4 letters), and AVAILABLE (9 letters). The term 'NOT TAKEN' implies that something is not being used or taken by someone. The solution 'FREE' suggests that the item is not being held or restricted by anyone, while 'LEFT' implies that it has been abandoned or LEFT behind. Finally, 'AVAILABLE' suggests that the item is still accessible and can be used by anyone.