They weren't in K&R. I recall a story about a standardization meeting, on the way to ANSI C, where representatives from some European(?) country that didn't hav

They weren't in K&R. I recall a story about a standardization meeting, on the way to ANSI C, where representatives from some European(?) country that didn't have some of the necessary punctuation on their country-specific keyboards, essentially snuck the trigraphs into the spec when the other representatives weren't looking.