An item carried on a key ring either as decoration or security.
A passive wireless electronic device that usually uses RFID technology to control access to buildings, containers, computers, etc. by being placed near a detector.
An active wireless electronic device that controls access to buildings or vehicles, such as a remote control for a car door lock.
A chain to which a pendant is attached, worn around the neck.
A ribbon, chain, scarf, or the like, tied around the neck in such a manner that the ends cross over each other.