Polyhedron
A polyhedron is a three-dimensional figure in which all the surfaces or faces are polygons.
Example 1
These scene in Harry Potter and the Sorcerer's Stone takes place on the Hogwart's Express when Harry is opening a magical candy called a Chocolate Frog. The box that contains the Chocolate Frog is a polyhedron.
"' What are these?' Harry asked Ron, holding up a pack of Chocolate Frogs. 'They're not really frogs, are they?' He was starting to feel that nothing would surprise him." -Harry Potter and the Sorcerer's Stone, Page 102
Example 2
This scene in Harry Potter and the Deathly Hallows, Part 1 takes place right after Harry, Ron, and Hermione disapparate from the Ministry of Magic to escape from Yaxley. The horcrux that they have just stolen from Umbridge, Slytherin's locket, is shaped like a polyhedron.
"It was as large as a chicken's egg. An ornate letter S, inlaid with many small green stones, glinted dully in the diffused light shining through the tent's canvas roof." -Harry Potter and the Deathly Hallows, Page 275