A tetrahedron shape sign block. 4 different signs can be assigned to each side of the tetrahedron. And the tetrahedron can be inserted into a stand so show different face by the user's choice.

Both tetrahedron and the “claw”s in the stand have prepared for contact pin to be installed. I have found some 4.5mm contact pin, but could not have time to really install them. With contact pins and proper wiring. The tetrahedron can have different internal lighting when inserted with differnt direction. The basic setup can have 4 colors for the 4 sides. But it can have maximum 12 colors combining face and direction (But probably need a bigger print.)