Made of soft wood, this ruler has symbol craved on it to allow users to communicate throught the symbols. A drawer with the meaning of each symbols has been created and can be only opened if you know the secret of this ruler. The key to open to drawers is the magnetic strip on the bottom of the ruler. The magnet will attract the ruler out so you can read it. A whiteboard sheet has been placed there so that users can reuse it over and over again.