Unobtanium
This is a photo of a real piece of metal that has been cooled to the point that it has become a superconductor. In the movie Avatar they say that Unobtanium is a room temperature superconductor. The unobtanium article on Wikipedia.
Edit: The fictitious Unubtanium is also mentioned on Pandorapedia.com.
Posted: December 30th, 2009 under movies.