The Norse God Odin was the main Viking god. He goes by some 36 different names. One name is Hrafnáss; "Raven-God."
Norse Myth tells us that Odin has a pair of Ravens perched on his shoulders. They are known as Huginn, "Thought" and Muninn "Memory." They are much more than Odin's pets; they are his Spies and Messengers. Odin sits on Hlidskjalf, his high seat above the clouds and sends his Ravens out every day as Spies and Messengers to fly throughout the Nine Worlds and, upon their return, relate to Odin every secret that they have found.
Ravens are also Spirit Guides: Raven's wisdom includes introspection, courage, self-knowledge, Magic, healing, creation, rebirth, keeper of secrets, master magician, shape shifter, and Mysticism.
The Magical Runes surrounding Odin's Ravens are the "Elder Futhark." Each letter is said to have Magical Powers.