http://lifeboat.com/ex/warning.signs.for.tomorrowBasically, this is what happens when someone thinks about the risks that a future humanity might be subject to given the assumptions central to various pieces of science fiction...and designs warning icons for them. Beautiful and brilliant; as a bonus, includes quick explanations for why some of these things are (or may become, or might be) dangerous. Where else are you going to find standardized warning signs for:
- nonstandard spacetime
- macroscale quantum system
- nanoparticle hazard
- memetic hazard
and quite a few more like them?
(It's hard for me to tell just how seriously this site as a whole takes itself. But it's interesting nonetheless.)