Attributes of Odin are Sleipnir, an eight-legged horse, which was given to Odin by Loki, and the severed head of Mimir, which foretold the future. He employed Valkyries to gather the souls of warriors fallen in battle (the Einheriar), as these would be needed to fight for him in the battle of Ragnarok. They took the souls of the warriors to Valhalla (the hall of the fallen), Odin's residence in Asgard.
Odin had three residences in Asgard. First, was Gladsheim, a vast hall where he presided over the twelve Diar or Judges, whom he had appointed to regulate the affairs of Asgard. Second, Valaskialf, built of solid silver, in which there was an elevated place, Hlidskialf, from his throne on which he could perceive all that passed throughout the whole earth. Third, was Valhalla, where Odin received the souls of the warriors killed in battle, called the Einheriar. Valhalla has five hundred and forty gates, and a vast hall of gold, hung around with golden shields, and spears and coats of mail. Also, no women or poor people were admitted to Valhalla and the only females were the Valkyries who were the female messengers and followers of Odin.
Odin has a number of magical artifacts associated with him: the dwarven spear Gungnir, which never misses its target, a magical gold ring (Draupnir), from which every ninth night eight new rings appear, an eight-legged horse (Sleipnir) and two ravens Huggin and Muninn|Mummin (Observation and Memory), who fly around the world daily, to which they report the happenings of the worlds to Odin at Valhalla nightly. He also commands a pair of wolves named Geri and Freki, to whom he gives his food in Valhalla since he consumes nothing but mead, or wine. From his throne, Hlidskjalf (located in Valaskjalf), Odin could see everything that occurred in the universe.
The Valknut is a symbol associated with Odin.
http://en.wikipedia.org/wiki/Odin