Pentameral symmetry is actually five-sided symmetry. This type of symmetry is found within the phylum Echinodermata.
One example of animal with pentameral symmetry is starfish which are similar in shape to a pentagram. Another example is sea urchin as an adult (its larvae has bilateral symmetry).
Pentameral symmetry is a type of radial symmetry – can be divided in several roughly identical pieces. Organisms with such a symmetry have no left or right sides, they have a top and a bottom surface, or a front and a back.