What does OS stand for?

MLA style: "OS." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 <a href="http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html">http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html
Chicago style: Acronym Finder . S.v. "OS." Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html">http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html
APA style: OS. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html">http://www.acronymfinder.com/Obsidian-Sanctum-(World-of-Warcraft)-(OS).html

Obsidian Sanctum (World of Warcraft)

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