Simon could also easily symbolize truth.  Out of all the boys, Simon is the first to have enough insight on the island to realize that perhaps the true beast was the boys' own human natures.  Later, as Simon confronts the Lord of the Flies, he uncovers this truth once again.  Simon's death in chapter nine could reflect how humanity can be blind to the truth, or even reject it; the boys do not even recognize Simon for what he is as they brutally murder him.  Simon could easily represent truth in Lord of the Flies.