Information Silo

The nuclear codes live in the minds of a small handful of military people (presumably). That information is "silo'd." It isn't broadly shared, other than among those military people for, uh, good reason.

Lots of people hate/fear/are just jealous of the United States, and would love nothing more than to nuke the crap out of us. So we keep information like that carefully protected, allegorically matched to the structure of a grain silo, which is where the term originated. Wheat inside of this silo thing gets mixed all over the place, but not a grain leaves nor enters from the outside world. Many companies carefully protect their own "nuclear" secrets in a similarly silo'd fashion.

So here's to a world which does not, in fact, glow in the dark.