The phoenix represents rebirth. It is known when people or things fall and are reborn stronger. The phoenix could e used to describe the novel as a whole. You can see this symbol many times throughout the novel, mainly with Montag.
13 Times Background Legolas Was The Most Important Part Of "The Lord Of The Rings" Movies
Viggo Mortensen bonded so much with Uraeus (Brego in the film), the horse he rode in the Lord of the Rings series that after they finished filming, he purchased the horse from its owner. He also bought his stunt double's horse for stunt double!