Description: Unobtanium is an old engineering joke which can be applied to any rare or hard to find material that has the properties needed to fulfill a given design but is unobtainable. This joke became a trope in science fiction, any material that is extremely useful, and practically unobtainable is collectively described as unobtainium. $20 million for 1 kilogram. Worth it.
You can get this design on tshirts, tank tops, hoodies and more in a generous range of sizes and colors.