By starting off, fire is a complicated symbol in the Lord of the Flies. Like the glasses that create it, fire represents technology. So far, like the atomic bombs destroying the world around the boys' island, fire is a technology that intimidates destruction if it gets out of control. Fire also symbolizes the boys' connection to human civilization, which is their signal fire gives them hope of rescue.
Quote from Chapter 2: "Shut up! Wait! Listen"He went on in the silence, borne on in his triumph"There's another thing. We can help them to find us. If a ship comes near the island they may not notice us. So we must make smoke on top of the mountain. We must make a fire""A fire! Make a fire!"
Look at me, I waved the conch!! (Ralph)
From this scene, it demonstrates a symbol of fire as the quote states in Chapter 2.
"If a ship comes near the island they may not notice us. So we must make smoke on top of the mountain. We must make a fire." (Ralph)
To clarify, fire signifies as a light of guidance. After the fire had gone out, Ralph calls an assembly to all the boys on the island. The main importance of the fire to Ralph caused him to see the problems within the group and so he is harshly set arrangements straight-forward.
"How can you expect to be rescued if you don't put first things first and act proper?" (Piggy)
This is the scene when Jack sets the whole thing on fire and then, it comes to them for their rescue as well as a lot of materials that are burned. To know this, the littl'un with the mulberry birthmark on his face burns alive and is killed by fire.
From this scene, Ralph runs to the beach to escape from Jack. Suddenly, he approached to a British Naval Officer and seeks to tell him what exactly happened. Therefore, he burst out into tears. When the boys appear to the beach, they started to cry as well.