A handcuff key pendant. Can be worn around the neck or on a keychain. Either way, it will look great.
I really designed this on a simple concept: its a key to a restraint. With a gear. Hence, it is a freedom machine. (Plus you could also use the explanation that a key is really a simple machine in itself)
***Please note this is not a real handcuff key. It will not fit into the lock on a pair of handcuffs.