small bathrooms. i have kind of a similar fear, but I'm really only scared of small bathrooms, or monochromatic ones or ones with labels and directions as to what to do (like airplane or cruise ship bathrooms) I hate flying because of my fear, and always avoid airplane bathrooms.
A rectangular prism is solid 3-dimensional object which has six  faces that are rectangles. It has 12 edges and 8 vertices.
Now, we will see how many faces does a triangular prism have. A prism is a type of a solid object, which has two identical ends and all the faces of a prism are flat. Prism is a type of a polyhedron. A triangular prism has five faces, six vertices and nine edges. A triangular prism is a three sided prism.