The conch symbolizes the need for order and democracy.
This is where they first started with the conch destiny. Piggy found the conch and Ralph and Piggy used it to call all the boys in for a meeting. They now used the conch for meetings.
"Im calling an Assembly" (Golding 75
The Importance of this quote is this is what started this story, this is what got everyone together.
"The conch exploded into a thousand white fragments and ceased to exist." (Golding 181)
The conch is now broken which changes everything. No more calling people for a meeting, a change up with chief's.