Where do I get Odin rune?

Could you please clarify for me where exactly I might acquire the Odin rune? I've heard rumors about its mysterious powers and I'm quite fascinated by it. Could you guide me to a reliable source or perhaps suggest a specific place where I might find it? I'm also interested in learning more about its origin and significance. Is there any specific ritual or ceremony required to obtain it? Your insights would be greatly appreciated.