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In its starting position, «TURN» has the normal function of a door handle.
Then, the door handle can be pushed back and turned down, which signals: Please do not disturb.
In a company, running meetings can be indicated. In hotels, the guest can indicate that he wants to sleep a bit longer, or if the personnel should clean the room. A kid can signal to the parents, the wish to be undisturbed, without the need for a key from the parents. In homes for the elderly, the toilet does not need to be locked so that in an emergency, immediate help can be provided.