A signage system is provided for use with load bearing poles. The system includes an upper pole section and a lower pole section, separable from the upper pole section. At least one upper flange block is positioned within the upper pole section and at least one lower flange block is positioned within the lower pole section. A load bearing shaft extends between or through each of the upper flange block and the lower flange block. Signage is coupled to or otherwise associated with the load bearing shaft, the signage being rotatable relative to at least one of the upper and lower pole sections.

A door opening detection device and a door opening recognition system are disclosed. The door opening recognition system comprises the door opening detection device and a robot. The door opening detection device is mounted to an inside door handle, and the robot comprises a communication module and performs a predetermined operation in an internal space located inside a door in a state where the door is closed. The door opening detection device is operated in a state where, when the door is closed, a door sensing unit connected to one end of a string is located inside the door and a tag connected to the other end of the string and connected to the door sensing unit is fixed to be located outside the door. As the other end of the string and the tag are pulled in the opposite direction to the direction of gravity through a door gap when the door is opened, the door opening detection device detects that the door sensing unit has been moved in the direction of gravity, and generates a detection signal corresponding thereto. Then, the robot receives the detection signal from the door opening detection device through the communication module, and recognizes the opening of the door and stops the operation on the basis of the received detection signal.

A door with an EXIT signal which operates automatically includes a door panel and a light source. The door panel includes a first plate. The first plate includes a front surface. The front surface defines a plurality of pits. The pits form a predetermined pattern, in the shape of a word. The light source is fixed above the first plate. The light source emits light to toward the pits to illuminate the predetermined pattern in the shape of a word when the door is in a closed state.

A door with an EXIT signal which operates automatically includes a door panel and a light source. The door panel includes a first plate. The first plate includes a front surface. The front surface defines a plurality of pits. The pits form a predetermined pattern, in the shape of a word. The light source is fixed above the first plate. The light source emits light to toward the pits to illuminate the predetermined pattern in the shape of a word when the door is in a closed state.