Where can you see a picture of a triangular prism?
Use the links below to see a triangular prism. If you want to visualize one, draw a triangle and lay another identical one on top of it. Then extend the top one “straight up” so it’s moving perpendicular to the plane the bottom triangle was in. After you’ve moved it up a ways, connect the verticies of the two triangles with perpendiculars lines and you’ll have drawn one.