The billboard is a signal tool in the pull system to start the next production process, or to transport the product in process to the downstream process. This term means "signal" or "signal board" in Japanese.

It refers to all outdoor media that transmit advertising information. Media size depends on the actual environment.

Shop signs, doors, and facades can be hand-drawn, computer-generated, or printed on paper. Billboard materials are generally used: square pipe, Angle steel, such as welded. Can have three dimensional board, lamp cloth, blister, car paint, gusset, aluminum-plastic board and so on