What is on Montag's helment, arm, and chest?

Helmet: #451

With his symbolic helmet numbered 451 on his stolid head, and his eyes all orange flame with the thought of what came next, he flicked the igniter and the house jumped up in a gorging fire that burned the evening sky red and yellow and black.

Arm & Chest

But he knew his mouth had only moved to say hello, and then when she seemed hypnotized by the salamander on his arm and the phoenix-disc on his chest, he spoke again.