What are some symbols in Romeo and Juliet?

Flowers: One of the most famous lines in literature comes from Romeo and Juliet: “That which we call a rose / By any other name would smell as sweet.” Here, flowers symbolize both beauty and love.
Stars: Romeo and Juliet are the “star-cross’d lovers.” Stars in this play are symbols of fate. The fact that the lovers are “cross’d” bespeaks the tragedy that is to come.
Darkness and Light: At the beginning of the play, Romeo is alone and depressed. His father says that his personal darkness is like “adding clouds to more clouds." But later, his depression lifts when Romeo compares Juliet’s beauty to light, the ethereal quality that defines her: “But soft! What light from yonder window breaks? It is the east and Juliet is the sun."
Poison: Friar Laurence concocts a “poison” that will make Romeo appear dead. His plan backfires and the young lovers commit suicide. Poison is a symbol of the way good people can make bad choices.