The Art of Knocking: Understanding the Language of Door Signals

In the context of doors and locks, "knock" refers to a specific pattern or sequence of taps or raps on the door. This can be used as a way to signal to someone inside the room that someone is outside and wishes to enter, without actually opening the door.

For example, a person might knock three times on the door to indicate that they need to speak with the person inside, or they might knock twice and then wait for a response before entering. The specific pattern of knocks can vary depending on the situation and the preferences of the people involved.

The term "knock" is thought to have originated from the idea of tapping on the door with a knuckle, although it can also be done with other parts of the body or with an object such as a stick or a fist.