Thanks Primus it's Friday. Why would I say that? Because it's the weekend and you can finally relax? No, it's because it's time for everyone's favorite end-of-the-week brain teaser. Just remember, fleshlings, If you want to hazard a guess as to the identity of this part, run a shmax search (http://www.shmax.com/view_faq#how_does_search_work_) and post a link to the Shmax details page. Good luck, super sleuths.
My awesomeness precludes me from running a search unnecessarily. :D
http://www.shmax.com/part_details/10689/Double-Blade
That's a piece from the Cybertron Deluxe Unicron figure. Not the world eater type but the rolling assault tank type...