The solid depicted in the image is a polyhedron. It appears to be a triangular prism, as it has two triangular bases and three rectangular lateral faces.

Here are the details:

• Bases: The two triangular faces $\triangle PQR$ and $\triangle STU$ are the bases of the triangular prism.
• Faces: The prism has 5 faces in total – 2 triangular bases (as mentioned above) and 3 rectangular faces ($PRST$, $RQUT$, and $PQSU$).
• Edges: There are 9 edges: $PQ$, $PR$, $QR$, $ST$, $SU$, $TU$, $PS$, $RT$, and $QU$.
• Vertices: The polyhedron has 6 vertices: $P$, $Q$, $R$, $S$, $T$, and $U$.

Would you like more details or have any questions?

Here are 5 related questions for further learning:

1. How would you calculate the surface area of this triangular prism?
2. What is the formula for the volume of a triangular prism?
3. How can you distinguish between a prism and a pyramid?
4. How does the number of faces, edges, and vertices change for different prisms?
5. What are the key characteristics that define a polyhedron?

Tip: To check whether a solid is a polyhedron, ensure that all faces are flat polygons, and there are no curved surfaces.