The first symbol that represents Piggy would be himself. On the island he represents order and democracy. Him and Ralph both struggle for order and democracy, but no one really likes Piggy so he's always alone in trying to get that. He tries to keep all the boys civilized but he never succeeds because no one ever wants to listen to him.

The second symbol associated with Piggy are his glasses. His glasses represent clear sightedness and civilization. Everyone depends on Piggy's glasses because they are the only things they have to keep the fire going. When Ralph's tribe take Piggy's glasses away from him, Piggy doesn't really pay attention to what's going on and when he goes to get them back from Ralph, they kill Piggy and destroy the conch. Piggy no longer knows what's going on and can't keep the boys civilized.

Piggy's constant polishing of...