There are many different symbolic images inThe Lord of the Flies, but the Lord of the Flies is a symbol himself. Towards the end of the novel when the Lord of the Flies speaks to Simon, is when his true symbolism comes out; the Lord becomes an indication of any type of beast and also a symbol of the power of evil. You could even take this answer as far as saying the Lord of the Flies symbolizes the devil whereas throughout the story, Simon portrays Jesus Christ (Biblical parallelism).
Beelzebub, or a satanic/demonic representaion
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The Lord of the Flies symbolizes the beast inside all of us. Simon might have been called a loony but he was the only one who found out who knew that the beast wasn't a real breathing creature but the beast inside all of us (lord of the flies). When Simon had the talk with the pig's head it might have been confusing but the pig wasn't talking it was his imagination.
Water in Lord of the Flies symbolizes rebirth.
adaptation to the island
lighting will symbolize the death and hardships of the boys and the dangers that they encounter with their surroundings and savage ways.
Simon's bower represents civilization.
It symbolizes the monstrosity and animalism of everyone on the island, when it was meant to be an offering to the beast. The beast was in all of them.