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Wiktionary
door chain

n. A device that allows a door to be partially opened from the inside, whilst preventing it from being fully opened from the outside

Wikipedia
Door chain

A door chain, security chain, or security door chain consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door.

Usage examples of "door chain".

Carla Ruiz looked out at him over the door chain and he showed her the gold shield.

Leannes not here, Beryl rasped, her heavily madeup eyes narrowed at Alex over the door chain.