The term handwavium (suggesting handwaving) is another term for this hypothetical material, as are buzzwordium, impossibrium and hardtofindium. The related term phlebotinum is used to describe a technological plot device created by a science fiction writer to magically advance the plot to a desired point. The term eludium (also spelled with variants such as illudium) has been used to describe a material which has "eluded" attempts to develop it. This was mentioned in several Looney Tunes cartoons, where Marvin the Martian tried (unsuccessfully) to use his "Eludium Q-36 Explosive Space Modulator" to blow up the Earth. Another largely synonymous term is wishalloy, although the sense is often subtly different in that a wishalloy usually does not exist at all, whereas unobtainium may merely be unavailable. A similar conceptual material in alchemy is the philosopher's stone, a mythical substance with the ability to turn lead into gold, or bestow immortality and youth. While the search to find such a substance was not successful, it did lead to discovery of a new element: phosphorus.