I worked at a K shop last summer, and when I was learning the language, I tried using sensible variable names. I was told in no uncertain terms that, when you write K, local variables should be one letter, globals should be two, and functions should be three.

It sounds like a total disaster, but after about two weeks (which is a long-ass time to learn a language), everything made perfect sense, and I really enjoyed using it for the rest of the time. It's very powerful and fast to execute, and after you get the hang of it, it's fast to write, too.