This is Shadowfax's most common and widely recognized holy symbol: a simple, stylized campfire.
Heat and light are his very essence. Fire is his trusted servant. The sun is his closest friend. There is only one to whom the raging wildfire or the burning lava will heed, and he is Shadowfax the god of fire, elder of the two Elemental Brothers.
They are figuratively kin, yet Shadowfax and Draak, the younger brother and god of elemental ice, are of completely different origins. While the latter was a creation of Dentin, the former is said to have been was wrought by the evil wizards of the during the wars of chaos and served the evil immortals of ages past. By some unknown feat he was able to escape his creators' punishment and become that which he now is.
Under the tutelage of one the greatest sorcerers to ever roam the world, Shadowfax learned the land, its wonders, mysteries, and secrets. Countless quests gained him favor from the gods of creation and legend. Eventually immortality - and with it the powers of Creation and Lore - was hard-earned through his works and deeds.
Many lands now owe their existance to him. A stalwart clan was formed with his aid, and thanks to his vigilance it has endured the test of time. Many adventurers have been enlightened by his ancient wisdom and patient instruction.
Followers of Shadowfax are elemental worshippers--therefore they are not devoted to he alone but also to Draak, and the Elemental Brothers are typically worshipped together. This plurality stems from the fact that their ideologies are complimentary, not only with each other but also with other members of the Pantheon, such as the Void. Shadowfax represents the purifying fire that will scorch the earth preceding Oblivion, and Draak invokes the awful cold of the nothingness that exists in the Void. Schlyne is also closely allied to the two, representing the death that follows the use of their elements, and it is not at all unusual to find followers that worship all these gods' aspects.