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 device or component for holding a key.
The individual or organisation with access to a cryptographic key.
A dominant partner who controls whether their submissive partner is able or allowed to orgasm or receive sexual stimulation, typically by locking the submissive partner in a chastity belt or chastity cage.
One who holds the key to a building etc. for security reasons.