Not all groups of eubacteria have peptidoglycan, so all eubacteria may be classified as either Gram-positive (able to bind Gram's stain) or Gram-negative (unable to bind Gram's stain).
A portable DVD player is in the shape of a rectangular prism. A soccer ball is in the shape of a truncated icosahedron. These shapes are all examples of polyhedra. A three-dimensional shape whose faces are polygons is known as a polyhedron. This term comes from the Greek words poly, which means many, and hedron, which means face.. So, quite literally, a polyhedron is a three-dimensional object with many faces.
A (general dodecahedron) is a polyhedron having 12 faces. Examples include the decagonal prism, elongated square dipyramid (Johnson solid ), hexagonal dipyramid, metabidiminished icosahedron (), pentagonal antiprism, pentagonal cupola (), (regular) dodecahedron, rhombic dodecahedron, snub disphenoid (), triakis tetrahedron, and undecagonal pyramid.