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.
An ornamental piece holding such a chain or ring.
A chain or ring to which a key may be attached.
A digital repository for the storage of cryptographic keys.