The Nova 6 gas in Call of Duty: Black Ops is a fictional chemical weapon, so there is no real-world equivalent or composition for it. The game's creators designed it as a deadly nerve agent with devastating effects. If you have any other questions about chemical compounds or fictional substances, feel free to ask!

November Annabelle Terra, better known by her nickname Nova, is a major character from the Starcraft franchise- a Dominion Ghost, an elite assassin unit, Nova was deployed to take down the most dangerous of Mengsk's foes. Nova is a cold and calculating threat, with no pity or remorse.