Trivision
![Illustration of a trivision advertising billboard](/Images/godic/202502/17/Trivision_advertising_illustration1718.png")
A Trivision, also called three-message sign, is a billboard/sign that consists of triangular prisms placed inside a frame. The prisms rotate 120⁰, each showing a new message of advertisement and/or information. As implied, three individual images, or messages, can be displayed on a Trivision.