I'm going to have to work that into an actual conversation one of these days: as isosceles once said, there are three sides to every triangle. I could totally see someone getting detained for this, I mean who knows what a slide rule is these days anymore? It probably would be mistaken for some sort of code machine.
Paul Simon and Peter Noone "didn't know what a slide rule is for", from their songs, actually different versions of the same song.
Pocket protectors with an assortment of mechanical pencils was for sissy nerds or nerd wanta-bes. True nerds carried their pocket slide rule in their shirt pocket. Now students carry their smart phones with the computing power of super computer from my undergrad days.